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Earlier I was nokia N86 user. Charger of that phone is same like SGS2. I charged my SGS2 with that charger. And I got the feeling that it was faster than original SGS2 charger.
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Give us some data on charging timers pls.
Details please....
Ok will give it in few days. I'll start calculating it.
Will u need any screen shots? If yes than how I mean is der any way to calculate time directly on phone?
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i have a nokia n97 mini charger which i use to charge my SGS2. It is indeed faster. But i guess it is because the nokia charger is capable of 1.2 A against only 0.7 A for the Samsung charger. Keep in mind that the voltage is the important number when matching chargers.
Both chargers are 5 V. Having higher A number means the charger is capable of giving out more power (power = V x A), power is energy rate (how much energy per second delivered). That is why Nokia's charger is faster, because it can give enery at a faster rate
fileexit said:
i have a nokia n97 mini charger which i use to charge my SGS2. It is indeed faster. But i guess it is because the nokia charger is capable of 1.2 A against only 0.7 A for the Samsung charger. Keep in mind that the voltage is the important number when matching chargers.
Both chargers are 5 V. Having higher A number means the charger is capable of giving out more power (power = V x A), power is energy rate (how much energy per second delivered). That is why Nokia's charger is faster, because it can give enery at a faster rate
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The question is: is this gonna waste the samsung's battery?
I'm no battery expert but wouldn't samsung have selected the amp level for a reason??
666fff said:
I'm no battery expert but wouldn't samsung have selected the amp level for a reason??
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Yes, Price been issuing an (I think 1amp) old htc charger. Not sure I notice a difference in charge speed, though its possible it still helps when running flash, oced etc by helping power the phone more so the battery isn't picking up the slack and can maintain charging without load. And no more amps can't hurt,a load will pull what it needs (more volts WOULD be am issue) Its like a 1200 watt pc power supply to run grandmas pentium computer wouldn't hurt it, just be under utilized. Make sense?
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Are you surprised it charges faster? I'm socked that my SGSII charger only throws out 700mA.
What are they playing at giving "travel charger" in the box?
The charge speed is directly related to the current output of the charger in use, as long as the phone is designed to accept a current higher than the lowly 700mA the standard one outputs.
With a 1A charger you should get (in theory) ~43% faster charging, assuming the phone and battery can draw that much current to charge.
Let's hope the phone supports this:
In Battery Charging Specification,[38] new powering modes are added to the USB specification. A host or hub Charging Downstream Port can supply a maximum of 1.5 A when communicating at low-bandwidth or full-bandwidth, a maximum of 900 mA when communicating at high-bandwidth, and as much current as the connector will safely handle when no communication is taking place; USB 2.0 standard-A connectors are rated at 1.5 A by default. A Dedicated Charging Port can supply a maximum of 1.8 A of current at 5.25 V. A portable device can draw up to 1.8 A from a Dedicated Charging Port. The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200 Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) will occur once both the host/hub and devices support the new charging specification.
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Would make charging insane.
I didnt understand whatever kani has quoted.
Plz somebody tell me is it safe to charge or not?
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Havent done any test but my old blackberry charger, charges the phone faster. Anything is faster than the stock charger.
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Hmm im interested in this thread, somebody with an electrical background should chime in on if its totally safe or not to use a charger with more current output.
I don't know if you european guys have different chargers than us, this is what mine reads.
input 100-240v- 50-60hz 0.15a
Output 5.0v 1.0A
unleashed12 said:
Hmm im interested in this thread, somebody with an electrical background should chime in on if its totally safe or not to use a charger with more current output.
I don't know if you european guys have different chargers than us, this is what mine reads.
input 100-240v- 50-60hz 0.15a
Output 5.0v 1.0A
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Mine says
"Input 100-240v- 50-60hz 0.15A
Output 5.0v 0.7A"
So yes, guess we do have different chargers
So i guess then NA has the theoretical 50% higher charging rate @ 1.0 A that one other guy was mentioning earlier; i was wondering because i really feel that my charge time on this phone isn't slow at all. Was looking to possibly make it faster even
Me too i saw a quickly charge with n97 charger.
But, with the original one, you gain like 1/2 hours of autonomy.
Quick charger = less time to charge the buttery but less time on battery
Slow charger = more time to charge buttery but more time of autonomy
The best should be charging the phone in offline mode using the computer
Mine says
Input : 150-300vac
50 - 60Hz 0.15A
output :5.0V 0.7A
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And On nokia charger
Input : AC100-240V/50-60HZ/160mA
output: DC 5.0V/1200mA
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I think it should be fine, i used another charger on my old HD2 for most of the time i had it (a year and a half) after i lost the original and never had any issues.
So can someone give a list of what chargers would charge the phone faster than the one that came with it.
thanks
The phone apparently limits the charging current to 650mA no matter the charger. Not sure I'd want to be the one testing increasing the cap though
http://forum.xda-developers.com/showthread.php?t=1132649&highlight=Charging
Hey guys,
What’s the maximum possible ampere for the Nexus 4 without damaging it?
The standard charger has 1,2A, so I guess that’s a save value.
My new EasyAcc Power Bank supports up to 2,1A, which would be really fast loading I guess.
But I don't want to damage it so I use the 1,3A slot until I know better.
Greetings
The service manual says the charging current is limited to 900 mA. So a higher capacity charger will only allow faster charging while the phone is working. So no faster charge, just not 'losing charge' if connected and working.
The service manual also claims the PMIC protects up to 28 volt. So I suppose it will also not draw too much current if the voltage is right.
jutezak said:
The service manual says the charging current is limited to 900 mA. So a higher capacity charger will only allow faster charging while the phone is working. So no faster charge, just not 'losing charge' if connected and working.
The service manual also claims the PMIC protects up to 28 volt. So I suppose it will also not draw too much current if the voltage is right.
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High amperage isn't something to worry about. Voltage is the important factor.
dweekie said:
High amperage isn't something to worry about. Voltage is the important factor.
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+1. i'm using a 2.5A portapow 5v charger with no ill effects.
Amps are not "pushed" to the device; rather it "pulls" what it needs.
Hello friends,
So I just got my Note 4 and i'm wondering how long should I keep it in charge for the first time? And should I drain it on first use or charge it when it's at let's say 20%??
Thanks in advance.
14 hrs, dont drain, battery should be between 20-80% before charging in normal use, fast charge off.
@zurkx
Thanks for the reply.
Are you sure about the 14 hours??? I thought Li-ion batteries don't need that long of a charging time !!!
XeroHertZ said:
@zurkxAre you sure about the 14 hours??? I thought Li-ion batteries don't need that long of a charging time !!!
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Please happily ignore that "advices".
Use Fast charge, charging takes exactly till the battery is full, that's about 1,5 hours for a full charge.
I don't see ANY sense in charging a LiIo battery "fuller than full", just impossible nonsense.
LiIo batteries suffer of aging, slightly increased by the number of charges, highly (!) increased by overheating, not of any memory effects.
There is NO "breaking in" of the Note 4s battery, amperage of fast charge doesn't come even near the safety limits, won't cause quick degradation or overheating.
So just don't listen go the immortal myths and "ancient wisdom" propagated by people not aware of the fact that battery technology indeed changed over the decades.
Chefproll said:
Please happily ignore that "advices".
Use Fast charge, charging takes exactly till the battery is full, that's about 1,5 hours for a full charge.
I don't see ANY sense in charging a LiIo battery "fuller than full", just impossible nonsense.
LiIo batteries suffer of aging, slightly increased by the number of charges, highly (!) increased by overheating, not of any memory effects.
There is NO "breaking in" of the Note 4s battery, amperage of fast charge doesn't come even near the safety limits, won't cause quick degradation or overheating.
So just don't listen go the immortal myths and "ancient wisdom" propagated by people not aware of the fact that battery technology indeed changed over the decades.
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Thanks Chefprol.I have done some research on charging the battery and have come to a conclusion that once it's charged I can use it straight away but and then drain it to 18 to 20% then charge it fully.
Chefproll said:
Please happily ignore that "advices".
Use Fast charge, charging takes exactly till the battery is full, that's about 1,5 hours for a full charge.
I don't see ANY sense in charging a LiIo battery "fuller than full", just impossible nonsense.
LiIo batteries suffer of aging, slightly increased by the number of charges, highly (!) increased by overheating, not of any memory effects.
There is NO "breaking in" of the Note 4s battery, amperage of fast charge doesn't come even near the safety limits, won't cause quick degradation or overheating.
So just don't listen go the immortal myths and "ancient wisdom" propagated by people not aware of the fact that battery technology indeed changed over the decades.
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Thanks ! i tought it would be a old myth to first drain the batery and then fully load it but as far as i know its only with old phones and mp3 players and such.
hope i will get my note 4 today ! waiting for it since monday
Fast Charge is not really a useful feature for me, it just hurts the battery more in the long run
what about the thoughts on conditioning the battery?
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There's no need to condition the battery, its a lithium battery.
If you're having battery drain issues I would suggest you clear your data cache.
ddaharu said:
what about the thoughts on conditioning the battery?
Sent from my SM-N910C using XDA Free mobile app
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this is the same guy making up stuff about the note 4 GPS being bad.
dont listen to fools.
First charge needs to be 14 hours to trickle charge the battery to full and make sure the meter is calibrated to a full battery.
fast charge does reduce battery life since it charges at higher voltage and amperage. any battery gets damaged a little by that. best is a slow charge (preferably Qi) at a normal charging voltage. Slower the better for longer battery life. if you want convenience over battery life then by all means fast charge and mess it up and replace after 2-3 years.
Who's post are you referring to?
zurkx said:
this is the same guy making up stuff about the note 4 GPS being bad.
dont listen to fools.
First charge needs to be 14 hours to trickle charge the battery to full and make sure the meter is calibrated to a full battery.
fast charge does reduce battery life since it charges at higher voltage and amperage. any battery gets damaged a little by that. best is a slow charge (preferably Qi) at a normal charging voltage. Slower the better for longer battery life. if you want convenience over battery life then by all means fast charge and mess it up and replace after 2-3 years.
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arjun90 said:
Who's post are you referring to?
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It's mine. That guy already bumped into me a while ago, now it's time for his revenge.
I'll care for that, now...
---------- Post added at 02:09 PM ---------- Previous post was at 01:32 PM ----------
zurkx said:
this is the same guy making up stuff about the note 4 GPS being bad.
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So here we go; you asked for it...
My critism about the Note 4 refers to it's GPS receiver, which is "deaf" compared to the competition and shows frequent signal drops.
More here: http://forum.xda-developers.com/note-4/general/gps-close-to-unusable-t2948602
dont listen to fools.
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Indeed - have a look:
First charge needs to be 14 hours to trickle charge the battery to full and make sure the meter is calibrated to a full battery.
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I already advised to realize this is 2014 battery technology, not the ancient batteries of the past.
Short: There is no "trickle charge" with Lithium-Ion-batteries.
See this: http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries - quote: "The difference lies in a higher voltage per cell, tighter voltage tolerance and the absence of trickle or float charge at full charge."
fast charge does reduce battery life since it charges at higher voltage and amperage. any battery gets damaged a little by that.
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Quote: "The charge rate of a typical consumer Li-ion battery is between 0.5 and 1C in Stage 1, and the charge time is about three hours. Manufacturers recommend charging the 18650 cell at 0.8C or less."
"C" is the capacity, 3220 mAh with our Note 4's battery. So we're save to charge with a current (milliamperes, "mA") of up to 3220 mA - if we follow the manufacturer's advice for the older type of batteries of that kind (18650 is an old warrior in the field), there's still 2576 A left.
So what does our fast charge supply deliver ? Look at it's ratings: 5 V, 2 A (2000 mA).
So even fast charge is far below the limits - our real limit is 3220 mA, but fast charging just uses 2000 mA.
Sound and safe.
Wonder about me highlighting "higher voltage" in zurkx's highly elaborate statement in red ? - Answer is above: The voltage does NOT change, it is NOT higher. Of course not !
The worst enemies of LiIon batteries are heat and age.
Heat is generated by a) placing the device at a hot spot (like behind the car's windscreen or in bright sunlight), b) by using demanding features like 4K video recording or highend games, c) by charging .
a) Your call. Just don't let your Note get hot. Overheating destroys your battery in no time. We're lucky we've got an exchangeable battery - so nothing to really worry about.
b) Your call. See a).
c) Charging produces some heat, especially on the "last mile", when the battery is "almost full", because the battery is a bit reluctant of getting charged up to the brim. So more heat is generated in that last phase. It's not much, won't reach the safety limits. It just can't, because the build-in charging circuits limits the current if heat gets up.
By the way: That integrated charging circuits are propped with safety measures, checking charge, condition, temperature and the like.
So even if you hook up a charger capable of providing 20 whopping amperes, the circuits just won't let that happen.
There is no way of providing the battery too much current; it's automatically limited.
best is a slow charge (preferably Qi) at a normal charging voltage. Slower the better for longer battery life.
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Again; welcome to the 21st century. We don't need any slow charge. It's the opposite.
Charging right slow has the danger that apps on the phone draw more power than the charge provides. That may drain your battery instead of filling it.
Plus: If you hook up the charger for long, it will be recharged (charge gets "topped off") frequenly. And every new charging attempt has a slightly negative impact on the battery's life; it's like wearing it a bit down. - Charge often, reduce your battery's life. That damage is tiny, by the way. But it is there, so hooking up your charger for many hours slowly kills your battery.
Now for the aging:
if you want convenience over battery life then by all means fast charge and mess it up and replace after 2-3 years.
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LiIon battery ARE AGING, up from the time of manufacture.
You all know that: You charge a device like you're told by the instructions - but after 1 to 3 years you notice a severe drop of usage time, a drop of capacity.
That's aging.
NOTHING you can do against that but buying a new battery.
So your battery will lose it's capacity over time; if you use it or not. You all know that, you all experienced that.
With the Note 4, we can happily buy a new battery if the old one runs out; it's that simple. But as a normal Li Ion battery reaches it's shelf live after 2 or 3 years anyway, there's NO (!) need of burdening it and you with slow charge. The results are exactly the same, with the difference that you save precious time with fast charging.
And now allow me quoting again:
dont listen to fools.
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Have a nice day, all of you except one.
youre completely wrong.
The QuickCharge tech charges at higher VOLTAGE and AMPERAGE.
http://www.androidauthority.com/quick-charge-explained-563838/
Quick Charge 2.0
Voltages 5v 5v / 9v / 12v
Max Current 2A 3A
Snapdragon 200, 400, 410, 615, 800, 801, 805
The rest is just BS as usual. You have no idea what youre talking about. Dumping 9V (Samsung Note 4 AFC) into a 5V battery makes it charge hotter and faster and degrades it significantly. After two weeks of fast charge i lost a small chunk off the top of my brand new battery.
just bad advice as usual.
zurkx said:
youre completely wrong.
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Yes, indeed. I was completely wrong by believing you'd understand some simple things.
In fact, I am not sure if I should take your statements for serious or just for a joke.
The QuickCharge tech charges at higher VOLTAGE and AMPERAGE.
Voltages 5v 5v / 9v / 12v
Max Current 2A 3A
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So you REALLY believe that changes of the output voltage of the POWER SUPPLY lead to the BATTERY charged with more volts ?
You can't be serious. That's technically impossible.
Let's put it easy:
If you insert your power supply into a 110 V receptacle in the USA, you get 5 V output.
So according to your "logic", using the same power supply in Europe (230 V) increases the voltage to 10 V ?
No. Just NO.
That higher POWER SUPPLY voltage is used for fulfilling the rule W = V * A (Watt = Volt * Ampere); just to be able to squeeze more power through the power supply's cable.
In the Note 4 and in the charging circuit, that voltage OF COURSE will be regulated down to the regular charging voltage - just with the benefit to carry more amperes.
So the CHARGING VOLTAGE stays the same; it does NOT follow the voltage supplied by the POWER SUPPLY. It never does.
So fast charging does NOT (read that: NOT !) increase the charging voltage. It cannot.
Got that now ? - Or do I need to put it ever more simple ?
It does not help using swearing words like "fool" or "bull****".
But it could help just saying: "Oh, sorry, I was wrong. - My apologies."
Make yourself at home with the basics of lithium ion and charging technology. THEN speak up.
Ah, overlooked something:
After two weeks of fast charge i lost a small chunk off the top of my brand new battery.
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1) Hope that chunk fell somewhere you were able to pick it up again.
2) How to you KNOW that ? I expect a detailled description about how you did the magic of finding out that your battery doesn't charge to 100 %.
3) If you KNEW that fast charging would kill your battery, wise man - why did you allegedly use the feature ? - Sorry, man... Your statements are not very trustworthy. I guess you never used that feature, just say so to strengthen your shaky point of view. Please don't mess with a perception psychologist.
4) If your battery really suffered, that might be due to your highly acclaimed and absolutely pointless 14-hours-charging-marathons, causing a permanent charge on/charge off cycle, weakening your battery.
So please just stop bashing a real useful feature of the Note 4. If you just love waiting ages for batteries to charge - your preference. But please stop spreading false facts about things you very obviously are not at home with.
And a last thing which might stop that aimless harassing fire of yours: I am HAM, a licenced amateur radio operator, holding the highest German licence class. These are the people who know a bit about volts and amperes.
how hard is it for you to understand that quickcharge 2.0 outputs higher VOLTAGE and AMPERAGE to charge the battery ? The charger charges the BATTERY AT 9V 1.67A up to 50% and then switches over to the regular 5V 2A charge rate. INPUT VOLTAGE (110V or 230V) has nothing to do with OUTPUT VOLTAGE. It charges the battery at 9V REGARDLESS of INPUT VOLTAGE.
edit:
also it has nothing to do with the cable. you must be crazy if you think a cable issue exists whether you transfer 15W or 10W across it. the cable is rated for well beyond that. the reason for the higher voltage is that modern lithium ions can accept high voltage charge rates with limited damage at low amperage. the reason they cut it off at 50% is the battery would be severely damaged if you tried to charge it to 100% and overshot. so yes quickcharge 2.0 really does charge your battery at a higher voltage than it was designed to be charged at. and no they dont have a magical transformer on your phone to go from 9V to 5V. otherwise they would be using it all the time and fast charge 9V to 100%. the wall plug is the only thing which has a transformer and the phone uses what it gets from there. they arent going to build half of another wall plug (9V DC-DC) and stuff it into the phone. it would generate heat and add bulk. Instead the PMIC "spikes" the battery with higher voltage and keeps it roughly constant (load modulation) by communicating with the quickcharge 2.0 AFC on the other end.
Hopeless.
I just love these battery threads, there's always some muppet who says the battery needs conditioning and must first be charged for a suitably ridiculous length of time. When it's charged it's charged, lithium batteries have no memory effect so the idea of conditioning them is moronic
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yes they have no memory effect. why ? because you say so.
other people believe otherwise because they actually test things out for themselves :
http://www.psi.ch/media/memory-effect-now-also-found-in-lithium-ion-batteries
http://pocketnow.com/2013/05/03/li-ion-batteries-memory-effect
http://www.nature.com/nmat/journal/v12/n6/full/nmat3623.html
no need to keep it for 14 hours, as they said in the catalog you only need to charge it till it's full, then unplug the charger.
Hello again !
After all cooled down a bit, here's some more information about that dreaded HIGH VOLTAGE fast charging uses which seemingly makes some of you wet your pants.
First, there's an experiment you can do yourself. You don't need to do - but it's quite impressive and gives you some proof of the things I say.
Get two 9 V batteries; the small rectangle ones we all know. Connect the positive contact of the first battery with the negative contact of the second. Thus you get an 18 volts DC power source.
Get a thin, isolated wire, short-circuit the open contacts with the wire. Wait.
Nothing special will happen, maybe the wire will get a little warm - and your batteries will eventually die.
(If you use a VERY thing wires, it might heat up.)
Now take a length of the same wire, do the same using your car's battery (12 – 13.8 V DC).
WARNING !
1) Take the battery out of the car, set it on solid ground with nothing combustible near !!! Do NOT try this with the battery still in the car !!!
2) Use pliers to connect the wire with the battery contacts !!!
3) Do that OUTDOORS !!!
Short-circuit the battery contacts using the pliers with the wire.
You don't need to wait. The cable will turn into a smoking, burning, white-hot thing in an instant.
Huh ? - We've got 18 V with just nothing happening, we've got just 12 V wreaking instant havoc and destruction !?
Amperage is the key !
Voltage alone does not cause the destruction, it's the amperage.
9 V batteries cannot provide sufficient amperes for killing the wire; 12 V car batteries do.
Short: High amperage kills wires, high voltage doesn't.
So back to our topic...
To fast charge our Note 4's battery, we need power, watts. But the tiny wires in the Note 4 can't withstand a high wattage; they would heat up like the wire connected to the 12 V car battery.
So Samsung uses a little trick, according to Ohm's law: W = V * A, W is watts, V is volts, A is amperes.
So we can achieve a high wattage by EITHER using a higher voltage OR a higher amperage.
Higher amperage does not work because it will kill the tiny wires in the Note.
So Samsung raised the voltage for carrying more watts from the power supply via the internal Note 4's cabling to the charging circuit.
That higher voltage gets transformed down to the normal charging voltage at the charging circuit.
Your battery is charged with the usual voltage, but with the benefits of a higher amperage.
That's all the magic: That higher voltage is used to carry more wattage to the charging circuit, but not beyond. Nothing else.
And that's why it does not harm your battery; charging voltage will not change - your battery just gets charged faster, always monitored by the charging circuit which will lower the charge accordingly if needed, so your battery will always be safe. That's why the "last mile" (charge from about 92 % to 100 %) takes more time to charge - because the charging circuit automatically lowers the charge to protect your battery.
So don't be afraid of that higher voltage; it never reaches your battery, it is just a means for transferring higher wattage via tiny wires.
Note: You ever wondered why Europeans use 230 V instead of 110 V ? - That's the reason. Being able to carry more watts over regular power lines without risking the wires heating up too much. It's not a means of destruction, it's the opposite.
There's a wall of text below, but you can skip all that here and just soak in my answers to some general interest questions. My data is presented below in case you want to bore yourself with the details.
See post #7 for QC3 data http://forum.xda-developers.com/showpost.php?p=66646418&postcount=7
1. Does using a micro-USB to USB-C adapter impede charging amperage, as measured by the Android OS?
No, actually not significantly at all. I'm somewhat surprised by this.
2. Does the LG charger work as fast as a certified QC2 charger?
Yes, pretty much.
3. Does AOD affect charging rates? With QC2, the amperage drops significantly if charging with the screen on, using the phone, etc. AOD probably is different, so let's prove it.
AOD does NOT appear to affect charging rates, though if the phone is charging in a bright environment it might.
4. What are some standard temperatures in these scenarios and at rest?
During charging, the highest my phone hits is ~31-32oC. With it plugged in but not delivering any amperage, it cools to ~23oC. At rest, unplugged, depending on ambient temps, it varies anywhere in the 20s.
5. What amperage does QC2 provide at max?
~3000mA, if the battery % is low enough. And not for very long. For comparison, on my G4, the max was about ~2400mA on QC2, 1800mA with a non-QC charger.
EDIT: I've found that the Android OS cannot accurately list amperage numbers. I think this is because it presumes all input will be at 5V. With QC2 and QC3, this is no longer the case. With my USB multimeter and a QC2 charger, the max amperage is ~2.4A, which slowly drops as the charging % increases.
6. How long does it take to fully charge the G5?
On QC2.0, 1 hour 20 minutes, from 0 to 100%.
There's been some discussion regarding charging rates and charging adapters on our newly released G5s. In the US, on T-Mobile, the phone comes with a QC2-style charger, "Fast Charge." I have read this is not exactly the same an official certified QC2 (I don't know how accurate that is though).
The QC2 standard supports 4 different modes, 5V/2A, 9V/2A, 12V/1.67A, and a 20v option. For comparison, QC3 has dynamic voltage, going from 3.2v - 20v.
The 'fast charge' adapter provided by LG supports the 9v and 5v modes, though the amperage is listed as 1.8A:
9.0V @ 1.8A or
5.0V @ 1.8A
In addition to the LG stock adapter, I also have a Tronsmart QC2 charger which is rated at 5V/2A, 9V/2A, and 12V/1.5A. http://www.amazon.com/Updated-Versi...direct=true&ref_=oh_aui_search_detailpage#Ask
In addition to the stock LG-provided USB-A to USB-C cable, I have some TechMatte micro-USB to USB-C converters, Benson approved. Everyone invested in Android has tons of micro-USB cords, but USB-C not so much. These cheap adapters help with the transition. They are the #1 sellers on Amazon and available here:
http://amazon.com/TechMatte-Connect...&redirect=true&ref_=oh_aui_detailpage_o05_s00
With my 2 chargers and 2 cable set ups, I attempted to systematically document the charging using Battery Monitor Widget Pro (BMW Pro), a great app because it will log a host of stats with no user intervention. (This may not be as accurate as someone using external equipment like a Charger Doctor, but it's good enough for our purposes).
First, some general observations. The first day I had the G5 I did not activate the SIM, nor did I install all my apps. So overnight, it sat connected to wifi but not doing much else. Doze was able to get an impressive -5mA drain for much of the night. Not such a surprise since it wasn't trying to do much. This is without AOD.
Second, when the phone was going through its initial re-installation of my dozens of apps, it ran up to ~40oC. I don't think this is surprising, but it was good to nail down a number.
Third, the voltage tops out at 4400mV. The charger keeps drawing a decent mA for ~40 minutes after it hits 100%. Maybe some additional top-off juice?
Methodology - No phone interaction during the relevant measurement time. Kept whatever other background apps running. BMW Pro logged measurements every 10 minutes. Connected to wifi.
Scenario A - QC2.0 Tronsmart charger with LG-supplied USB-C cable. I would expect this to be the fastest since the charger has 3 modes to choose from (though the wattage from the 12V and 9V is technically the same) and there is no adapter to flow through.
This charging cycle data was collected after I ran my battery completely down. I then rebooted and plugged in the charger asap. This data shows the max amperage to be ~3000mA. This slowly decreases over time.
A simpler read of the charge rate data:
18% @ 10 min, 3063 ma
38% @ 20 min, 2866 ma
57% @ 30 min, 2653 ma
72% @ 40 min, 2025 ma
84% @ 50 min, 1484 ma
92% @ 60 min, 974 ma
97% @ 1:10, 538 ma
100% @ 1:20, 437 ma
Scenario B - Always on display with Tronsmart QC2.0 and USB-C cable. Does AOD change anything from Scenario A?
One thing I noticed is that the AOD is responsive to ambient lighting! So that definitely could alter whatever charging curve we record. This cycle was initially started at 0% in a room with some fading sunlight but no direct illumination. This run was hampered by the phone shutting down from a low battery at the very beginning of the cycle despite being plugged in! Maybe there was too much current demanded by the phone as it booted up and with the AOD on. So this run necessitated starting at ~2%. Hence a 2% 'bump' in the early data points.
Transcribing the data:
21% @ 10 min, 3017 ma
40% @ 20 min, 3065 ma
60% @ 30 min, 2654 ma
74% @ 40 min, 2022 ma
86% @ 50 min, 1482 ma
93% @ 60 min, 975 ma
97% @ 1:10 min, 537 ma
100% @ 1:20 min, 399 ma
Once again it takes 1:20 for a full charge. Despite the 2-3% variability on the lower end, the higher data points basically match Scenario A's. So I would conclude having AOD on does not affect charging times, though that could change if the phone was in a bright environment.
Scenario C - "Fast charge" adapter provided from LG, with micro-USB to USB-C adapter. I would have guessed this would be the slowest charge.
Starting amperage here was again ~3000mA. I didn't start this cycle at 0%, probably more like 25%, but the charging percentages coincidentally lined up remarkably well for a good comparison. (I'd want a 0% start cycle to really confirm this data which I may add in the future).
38% @ 10 min, 3065 ma.
58% @ 20 min, 2654 ma
72% @ 30 min, 2021 ma
84% @ 40 min, 1479 ma
92% @ 50 min, 974 ma
97% @ 60 min, 664 ma
100% @ 1:10 min, 419 ma
So even though the charging started at 25% battery (so obviously the time measurements can't line up), the % charged sample points line up for nearly direct comparisons to Scenario A. At each battery %, the mA are nearly identical. So I'm concluding there's very little mA loss from the adapter.
You might argue for 2 other scenarios here for full comparison, the QC2.0 charger with the adapter and the LG charger with the USB-C cable. Maybe in another update. Currently, I think Scenario A and C here would be the fastest and slowest, respectively, at charging, so showing there is no difference at the extremes makes the other 2 scenarios less important.
If you get a chance, can you try with screen on & verify if you see what I've found that QC3 charges then at 1A & QC2 at 0.3A above 35c & 0.6A when cooler than 35C.
If so, it confirms that the real tangible benefit of QC3 is if you charge with screen on frequently, eg in a car would see a big boon.
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seems strange they have stepped away from the usual cc/cv li charging routine. is this a QC change?
I'm still in the midst of collecting data for the next presentation. There are a lot of permutations to go through, with a couple of cables and chargers.
In the meantime, I did confirm @stuart0001's observation that with the screen on, QC3.0 charges at ~1000mA, seen below (yellow band means screen on, green means AC power charging):
I didn't charge it all the way, just for ~30 minutes, but each measurement during that time did show the same charging amperage.
Also to add thoroughness, I have ordered a USB current/volt passthrough meter to more accurately report what happens.
More to come!
i find that the cheap as chips Samsung fast adaptive (2we version) charger you can get for around £5 on ebay works perfectly with the G5 and it recognises it as a fast charger.
waylo said:
I don't have a QC3 charger and I am debating if it is really worth it.
Click to expand...
Click to collapse
It's easier on the battery so you might get more life out of it.
QC2 charges as fast as it can then slows.
QC3 charges as fast as the phone will allow.
This can have a bearing on battery longevity. How much longer is debatable since you're still using QC which will be more stressful than non QC. The stock charger might not be QC but it is a fast charger and 1h30 is about std to from from empty to full with it.
See this post
less than a year and its replace battery time. Fortunately, not a big deal on LG's
QC3.0 data!
I have been working with 2 QC3.0 wall chargers with USB-A ports over the past couple of weeks. I’ve also purchased a USB voltmeter/ammeter to help with more measurements to understand our charging capabilities.
One charger is the ChoeTech QC3.0 18W USB Wall Charger, available here:
http://amazon.com/Charge-Charger-Co...&redirect=true&ref_=oh_aui_detailpage_o02_s00
The other is the Tronsmart WC1T 18W USB Wall Charger, available here:
http://www.amazon.com/Tronsmart-WC1...rue&ref_=ox_sc_sfl_title_1&smid=ALTVS0Q5KJ7M3
For full disclosure, I received both as free retail products courtesy of each company. They were both delivered via Amazon so they are the same as you’d get if you ordered them yourself.
I purchased for myself a very cheap USB multimeter, available here: http://www.ebay.com/itm/400963912153
It does okay. I then purchased a more reputable Drok multimeter, available here: https://www.amazon.com/DROK-Multime...true&ref_=ox_sc_act_title_1&smid=AFHAE9RJVUMB
Finally, ChoeTech provided a fairly capable USB multimeter of their own manufacture for my testing purposes.
Once again, my talking points first. Then a bunch of nitty gritty details afterwards if you so care.
1. Both QC3.0 chargers are made well and supply variable voltage, the main difference between QC3.0 and QC2.0.
2. The charging times for QC2.0 and QC3.0 are nearly identical!
3. The voltage used to attain these charging times, however, is much lower in QC3.0 than QC2.0. This will help with battery longevity.
4. We do NOT get the 80% in 35 minutes charging that is sometimes touted in QC3 ads. More like 65%. There are some reasons for this.
5. USB-C specification compliant USB-A to USB-C cables DO NOT limit our QC3.0 phone to 5V and 2.4A. This is safe per Qualcomm.
6. Our G5 phones seem to like ~6.5-7.0V charging voltage when used with a QC3.0 adapter. With our LG QC2-ish fast adapter it stays around 9V the whole time.
First, some relevant technical info re: USB-C standards vs QC3.0 charging.
QC3.0 is by definition not compliant with USB-C standards, because variable voltage is not allowed by the USB-C specification. So Nexus USB-C’s charging, which is adherent to USB-C spec, is not the same as Qualcomm QC3.0. You may have heard of Benson Leung, the Google engineer, who has set out to test USB-C devices and accessories. He does not endorse the G5 or the HTC 10 because they do not completely adhere to USB-C spec, but rather Qualcomm’s QC3.0.
Just because the cables are not USB-C spec does not mean that they are unsafe. To me, it really just means that USB-C spec devices may not be able to properly draw current from a power source when using a non-spec USB-C cable, which could damage the power source. Not exactly relevant to Qualcomm’s QC3.0. In fact, Qualcomm put out a statement to qualify this: http://www.androidcentral.com/qualcomm-addresses-usb-type-c-and-quick-charge-30-compatibility
The USB-C specs become a bit relevant when talking about USB-A to USB-C cables and adapters. Due to the circuitry required to make these spec, these cables and adapters are limited to 5V @ 2.4 A when used by USB-C spec devices. All the ones that Amazon sells now are USB-C standard compliant.
Based on my testing, however, this limitation does NOT extend to QC devices. We definitely get > 5V on my voltmeter testing. This was using both the LG-supplied USB-A to USB-C cable, as well as a Benson-approved USB-A to USB-C cable. The amperage measured with the USB volt/ammeter does not typically go >2.5A however. This may be more a reflection of the wattage rating of the chargers. They top out at 18W, and wattage = voltage * amperage. The top amperage their stats spout is 3A.
With the supplied LG fast charger (QC2.0-esque), it will hang out at 9V the entire time with the amperage starting out around 2A and then dropping as the battery fills.
I had stated previously in many places that the amperage tops out around ~3A early in the charging process, which is from data collected via the app Battery Monitor Widget (BMW). This is incorrect, due to the way the Android OS reports amperage. I have been informed that the Android OS amp data is based on 5V charging, so anything different from that (as we would see on QC2 and QC3) can result in erroneously high amperage readings.
I do not know if the LG supplied cord is spec because I do not have the equipment needed to test it (basically just a Nexus and the CheckR app). But I will be incorporating it into our test data to show you how it compares.
Here's a snapshot of the relevant stats printed on the adapters, with the Tronsmart on the left and the ChoeTech on the right:
One notable difference is that on the Tronsmart, the voltages are printed as variable, which is one of the major improvements to QC3.0. Interestingly, on the ChoeTech there is no mention of variable voltage. In my testing it does vary the voltage similarly, but my personal opinion is they are missing out by not advertising this on the label.
Other notable pros/cons:
1. The ChoeTech has a reversible USB-A port, so it doesn't matter which end is up. That's nice. It also comes with a USB-A to USB-C cord, though only 3 feet long.
2. The ChoeTech cable supplied is the same USB-A to C cable which has been reviewed and approved as USB-C spec by Benson Leung here: http://www.amazon.com/review/R3URN3...sb-20&linkId=9f4d7368af5d896b0482e4f62db75d06
ChoeTech support has confirmed this personally.
3. The TronSmart comes with a longer cord, but unfortunately it’s USB-A to micro-USB. It’s too bad it’s micro-USB, because I’m not aware of any QC3 phones that use microUSB. So you’ll need an adapter or a different cord.
First up, the ChoeTech.
@stuart0001 has posted an earlier review of the ChoeTech UK version, seen here: http://forum.xda-developers.com/lg-g5/accessories/choetech-qc-3-0-18w-wall-charger-t3356038. Interestingly, he found that the charge rates were exactly the same as his LG fast charger if the screen was off. There were some situations were QC3 charging was much better with the screen on at high temperatures.
For the first ChoeTech test run, I used the LG-supplied cable.
Top off amperage was applied for an additional 30-40 minutes after hitting 100%.
I repeated this with the ChoeTech Benson approved cable and found identical results.
Onto the Tronsmart. I used the G5 supplied LG cable first.
Repeating the cycle with the ChoeTech Benson approved cable gave nearly identical data.
Comparing side by side by side the QC2.0 data with the QC3.0 data:
So very intriguing. Just like with @stuart0001 's analysis, the charging times did not differ much at all from QC2.0 charging!
But there’s more to this than just the charging times. Using my voltmeter, the voltage for each charger is a bit different. Using the LG fast adapter, the voltage hangs around 9V for the entire duration with the amperage slowing decreasing.
Using QC3.0, voltage ranged between 6.3 - 8.3V, with amperage maxing at 2.7A.
(Note the nonstandard charging time data points. The voltmeter does not have any logging capability, so I physically had to check on it throughout the hour+. Sometimes I had things to do )
QC3.0 advertises 80% fill in 35 minutes for QC3.0, compared with 65% for QC2.0. We don’t really see this though. Possible reasons?
1. The phone has preset charging parameters that won’t let us go that fast. A Tronsmart support person has told me that the G5 likes 6V as its optimal charging level. We do see this on the voltmeter results much of the charging cycle. I believe this is set in the kernel programming.
2. The 18W rating on the chargers tested won’t allow for greater amperage or voltage. There are 24W chargers out there.
3. The USB-A port on the chargers have some limit? Would love to test a USB-C port QC3.0 charger (I think there’s only one on Amazon right now).
4. There is some sort of charging limitation in the USB-A to USB-C cable after all.
More ideas to think about.
EDIT:
Attempts to monitor charging voltage/amperage of the USB-A to micro-USB with USB-C adapter result in repeat disconnects and reconnects.
I think the amperage and voltages are too high for the connected USB meter to measure and pass through.
EDIT 2:
I purchased a more reputable USB meter and it works now. The cheap one would throw a fit and reset/cut off charging when the voltage or amperage hit its upper limits. I may re-test some of the voltage measurements in the future.
@waylo Thanks for that excellent write up.
Picking up on the Qualcomm advertised estimate. It's disingenuous at best (I'd say they're being fraudulent) . They state in small print that it's based on the 0-50% current, so how they can justify extrapolating that instead of using the actual time is beyond me.
https://www.qualcomm.com/products/snapdragon/quick-charge
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Haha, that is very very sneaky of them. Seriously, why don't just extrapolate the first 20 minutes (40% then) and say it'll be full in 45 minutes then?
Getting some weird results on the USB meter trying to measure QC3.0 through USB-A to USB-micro cable with a USB-C adapter on it. Do you have one to try with your voltmeter?
waylo said:
Haha, that is very very sneaky of them. Seriously, why don't just extrapolate the first 20 minutes (40% then) and say it'll be full in 45 minutes then?
Getting some weird results on the USB meter trying to measure QC3.0 through USB-A to USB-micro cable with a USB-C adapter on it. Do you have one to try with your voltmeter?
Click to expand...
Click to collapse
Yes I have. I can have a look later. Something else I've noticed occasionally, but need to try & repeat, is that even different USB-A to C cables are giving quite wildly different voltages on the same charger.
Sent from my LG-H850 using Tapatalk
waylo said:
With the supplied LG fast charger (QC2.0-esque), it will hang out at 9V the entire time with the amperage starting out around 2A and then dropping as the battery fills.
Now, I have stated in many places that the amperage tops out around ~3A early in the charging process, which is from data collected via the app Battery Monitor Widget (BMW). So there is a bit of a discrepancy here. I have been a big advocate for BMW over other apps, due mostly to its passive logging. The dev of BMW has emailed me saying the mA is provided by the Android OS using a current sensor. So as of now, I don’t have a good explanation for how I routinely get ~3A charging amperage logs for the first 20 minutes while my ammeter does not show that draw. Could be a cheap (certainly) and inaccurate (don’t know) ammeter for all I know.
Click to expand...
Click to collapse
Am more likely to trust those cheap meters because they have proven to be invaluable in diagnosing charging problems with older devices. Software based tools proved to be not very useful with fault finding.
So getting 3A in software and the meter reading 2A implies an error of 50% with the meter. That is way too high an error. Don't believe it.
It's good to have both as a check but i'd side with the meter. It isn't faulty.
---------- Post added at 08:16 AM ---------- Previous post was at 08:08 AM ----------
stuart0001 said:
@waylo Thanks for that excellent write up.
Picking up on the Qualcomm advertised estimate. It's disingenuous at best (I'd say they're being fraudulent) . They state in small print that it's based on the 0-50% current, so how they can justify extrapolating that instead of using the actual time is beyond me.
https://www.qualcomm.com/products/snapdragon/quick-charge
Sent from my LG-H850 using Tapatalk
Click to expand...
Click to collapse
Usual BS claims in the tech industry...once people start poking around the real picture emerges.
One Twelve said:
Am more likely to trust those cheap meters because they have proven to be invaluable in diagnosing charging problems with older devices. Software based tools proved to be not very useful with fault finding.
So getting 3A in software and the meter reading 2A implies an error of 50% with the meter. That is way too high an error. Don't believe it.
It's good to have both as a check but i'd side with the meter. It isn't faulty.
---------- Post added at 08:16 AM ---------- Previous post was at 08:08 AM ----------
Usual BS claims in the tech industry...once people start poking around the real picture emerges.
Click to expand...
Click to collapse
It's a trick one. However the reported values in apps seem in step with the % gain and battery capacity. ie it's 2800mAh capacity so at 3A you'd expect 50% charge in 28 minutes which is what you get.
Also, the meter reports output but won't account for usage drain & won't give the net +ve charge current the battery is actually receiving.
It comes down to the correct measure for capacity should be watt hours. I suspect the software reports must be using a fixed internal volt number & applying that to the received watts to give a mA figure.
Ultimately, if we think of the mA software #s as really a relative guidance simply on how fast it'll fill 2800, it's as good as any real life measure
http://www.goalzero.com/solarlife/2...-question-of-battery-capacity-in-electronics/
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https://www.youtube.com/watch?v=yYx6GW-HaVg
4:30 onwards.
Says he got from 5% to 91% within an hour with the stock charger..
That would be faster than QC2.
One Twelve said:
https://www.youtube.com/watch?v=yYx6GW-HaVg
4:30 onwards.
Says he got from 5% to 91% within an hour with the stock charger..
That would be faster than QC2.
Click to expand...
Click to collapse
That's bull**** I reckon
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stuart0001 said:
That's bull**** I reckon
Sent from my LG-H850 using Tapatalk
Click to expand...
Click to collapse
From the last page.
At 90 within the hour.
2. Does the LG charger work as fast as a certified QC2 charger?
Yes, pretty much.
Click to expand...
Click to collapse
One Twelve said:
From the last page.
At 90 within the hour.
Click to expand...
Click to collapse
I stand corrected. ?
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So is there any need to get additional chargers and cables ? What compelling arguments can be made to support that.
why not just use what came in the box
I don't believe LG would intentionally supply a charger & cable that could be harmful to the G5 despite what Benson Leung says.
Regarding the current discrepancies.
I put my phone in aeroplane mode & killed all running apps room minimise background draw.
If I multiply the Amps by Volts of both meter & 3C app (mV/1000) to get Watts, I'm generally getting a fairly consistent 15% higher on the meter. This is likely due to adapter compensating for efficiency loss of the cable & some draw used by background apps.
So both methods appear to be accurate in their own way.
I'd say the meter is good to assess it's maximum wattage & the voltage range but if you want to know how quick it charges the phone, software is best.
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---------- Post added at 07:34 PM ---------- Previous post was at 07:04 PM ----------
One Twelve said:
So is there any need to get additional chargers and cables ? What compelling arguments can be made to support that.
why not just use what came in the box
I don't believe LG would intentionally supply a charger & cable that could be harmful to the G5 despite what Benson Leung says.
Click to expand...
Click to collapse
If you use the phone a lot whilst charging, above 32c with screen on, QC 3.0 is significantly faster. In fact I've seen QC 2.0 not even be able to supply enough for a net positive current.
For me, after seeing the results, in car at least is a must for QC 3.0.
Screen off they are near identical.
The voltage granularity of QC 3.0 may mean slightly prolonged battery longevity but no really an issue when we can swap batteries anyway.
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stuart0001 said:
[MENTION=2562936]https://www.qualcomm.com/products/snapdragon/quick-charge
Click to expand...
Click to collapse
Says its a 1.5C charge. But only upto 50%.
Compare with this graph from here.
if you can charge the battery completely in 1 hour its a 1C charge.
But the table above indicated it took 80 minutes to completely charge. Implying its less than 1C charge for the total.
Then there is the discharge bit. Can anyone kill their battery in 1 hour ? that's a 1C discharge.
I don't know anybody that can do that. The fastest i've seen is dead in 1h30 with 4k video. 1% an hour. Still not a 1C discharge.
Am beginning to think fast charge, quick charge some other speedy charge per se ain't doing anything bad for the battery
What is more likely to do it is operating temperature.
All batteries achieve optimum service life if used at 20°C (68°F) or slightly below. If, for example, a battery operates at 30°C (86°F) instead of a more moderate lower room temperature, the cycle life is reduced by 20 percent. At 40°C (104°F), the loss jumps to a whopping 40 percent, and if charged and discharged at 45°C (113°F), the cycle life is only half of what can be expected if used at 20°C (68°F).
Click to expand...
Click to collapse
stuart0001 said:
If you use the phone a lot whilst charging, above 32c with screen on, QC 3.0 is significantly faster. In fact I've seen QC 2.0 not even be able to supply enough for a net positive current.
For me, after seeing the results, in car at least is a must for QC 3.0.
Click to expand...
Click to collapse
One Twelve said:
Says its a 1.5C charge. But only upto 50%.
Compare with this graph from here.
if you can charge the battery completely in 1 hour its a 1C charge.
But the table above indicated it took 80 minutes to completely charge. Implying its less than 1C charge for the total.
Then there is the discharge bit. Can anyone kill their battery in 1 hour ? that's a 1C discharge.
I don't know anybody that can do that. The fastest i've seen is dead in 1h30 with 4k video. 1% an hour. Still not a 1C discharge.
Am beginning to think fast charge, quick charge some other speedy charge per se ain't doing anything bad for the battery
What is more likely to do it is operating temperature.
Click to expand...
Click to collapse
You're probably right. For me, because I can replace the battery, being able to charge quickly in the car is more important than longevity.
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I was looking for modules to enable quick charge for Mi A1, but all I found was the mistake Xiaomi made during Oreo beta. Is there any modules to enable quick charge for Mi A1, or someone to develop a module using magisk? I've installed Magisk Manager to install Gcam, that's what made me curious. Correct me if I'm wrong in any statement!
Quick charge is generally not a good idea because it lowers the lifespan of the li-ion battery. The stock 10W (2A) charger will charge the battery at 1.5C rate which is already above the recommended standard 1C.
If you are referring to the Qualcomm's Quick charge technology... No.... Except for the obvious kernel and android changes there are also several hardware changes that need to be done for it to be enabled. Also given that 625 is with QC3 you won't really notice that much of a decrease of charging time. We still have pretty good charging times and given that the battery is only 3K it is really not that much of a deal. In the end you'll have 10-15min faster charging. Also at the end of the charging cycle (around 90%) QC is lowered to an ordinary charging, so for small batteries like ours it doesn't really have that much of a use. Also given that our battery is not easily changeable, QC and all types of faster charging lowers the lifespan of the battery significantly and it can go down in less than two years. If it is subjected to regular higher temperatures(>40 degrees Celsius it will start to form copper inside of the battery and will increase its self discharge significantly) it will go down in an less than an year.
Some custom kernels - like moun kernel - have fast charge enabled.
Speed up is not rly high.
Roadwuzel said:
Some custom kernels - like moun kernel - have fast charge enabled.
Speed up is not rly high.
Click to expand...
Click to collapse
Thanks, I'll look into it!
Quick Charge cannot be enabled( or shouldn't be ) on MI A1
Firstly let me clarify, I'm using RR ROM which has Moun Kernel by default, it has USB Fast Charge which is not to be confused with Qcom Quick Charge because it means it will Fast Charge( @10watts ) when on USB, that is plugged on a computer. On Stock ROM it charges very slowly when on USB.
Talking about Qcom Quick Charge, though sd 625 supports it, other hardware such as the battery isnt built to support higher voltages which can potentially damage the phone.
So no Quick Charge on MI A1
barrack1 said:
Quick charge is generally not a good idea because it lowers the lifespan of the li-ion battery. The stock 10W (2A) charger will charge the battery at 1.5C rate which is already above the recommended standard 1C.
Click to expand...
Click to collapse
MiA1 has 3000mAh and supplied [email protected] charger gives 2A only! (I actually do get 2A charging up to 80% SoC).
Therefore, the MiA1 charging is at 2/3 = 0.67C and NOT 1.5C as you state.
For 0.67C, the time for 70% charging is 0.70/0.67 = 1.045hr = 63mins, which I'm getting in practice.
For 1.5C, 70% charging will be in 0.70/1.5 = 28mins!! Not just possible. Nobody, who tried fast charging using higher than 10W charger, has reported anywhere except slight decrease in charging time (for 70% charge).
The LiPo Battery in MiA1 is BN31. There may be a max charging current limitation circuit in BN31. I read somewhere (lost the reference, unable to find again) that 2.2A is the max limit.
In that case we get 0.73C and time for 70% charge will be 0.7/0.73 = 58mins. This HAS been reported using [email protected] at 3A. (BN31 allowing only 2.2A).
Add on Update:
There is one report on slightly faster charging of BN31. The max charging current is estimated to be 2.485A that is at 0.828C.
MiA1 got 0-100% charged in 92mins using One Plus' Dash Charger (not the charger provided which charges at 0.67). This is reported by TelecomTalk.
This is 24% faster than normal.
manabsac said:
MiA1 has 3000mAh and supplied [email protected] charger gives 2A only! (I actually do get 2A charging up to 80% SoC).
Therefore, the MiA1 charging is at 2/3 = 0.67C and NOT 1.5C as you state.
For 0.67C, the time for 70% charging is 0.70/0.67 = 1.045hr = 63mins, which I'm getting in practice.
For 1.5C, 70% charging will be in 0.70/1.5 = 28mins!! Not just possible. Nobody, who tried fast charging using higher than 10W charger, has reported anywhere except slight decrease in charging time (for 70% charge).
The LiPo Battery in MiA1 is BN31. There may be a max charging current limitation circuit in BN31. I read somewhere (lost the reference, unable to find again) that 2.2A is the max limit.
In that case we get 0.73C and time for 70% charge will be 0.7/0.73 = 58mins. This HAS been reported using [email protected] at 3A. (BN31 allowing only 2.2A).
Click to expand...
Click to collapse
You're right that the stock charging rate is 0.67C which is a very moderate charging rate. No idea why the battery still heats up noticeably sometimes during charging. There was a change in the charging icon I think for the Oreo update which gave the erroneous impression that fast charging (>10W) was supported and people started (wrongly) reporting decreased charging times fueling the myth.