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.
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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
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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
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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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If yes, Then let me know which brand of charger should i buy!
No.
I think it only supports QC 2.0, though the QC 2.0 charger does not come out of the box. But imo, who needs fast charging when the battery life can last up to 2-3 days with this phone.
in it's specs sheet in gsmarena quick charge 3.0 is listed. That's why i asked.
anyway, what's the best quick charge 2.0 charger out there? and will that charge the device faster than the original charger?
Jaisun said:
in it's specs sheet in gsmarena quick charge 3.0 is listed. That's why i asked.
anyway, what's the best quick charge 2.0 charger out there? and will that charge the device faster than the original charger?
Click to expand...
Click to collapse
The 625 snapdragon processor does support Quick Charge 3.0, but Xiaomi prohibits using it i guess to cut cost, i know some user who try to use QC 3.0 on this phone but it doesn't work, to be honest i'm also not sure about QC 2.0, my advice is you should try testing it first by borrowing QC 2.0 charger with some of your friends/relatives that has QC 2.0 charger before attempting to buy one.
Flynhx said:
The 625 snapdragon processor does support Quick Charge 3.0, but Xiaomi prohibits using it i guess to cut cost, i know some user who try to use QC 3.0 on this phone but it doesn't work, to be honest i'm also not sure about QC 2.0, my advice is you should try testing it first by borrowing QC 2.0 charger with some of your friends/relatives that has QC 2.0 charger before attempting to buy one.
Click to expand...
Click to collapse
No QC 2.0 support for me, tested with new xiaomi powerbank 10000mAh, ampere show max usb current 500 mAh instead of 2000 mAh. However from measurement I can get 1700-2000mAh so still charging fast enough.
Redmi 4 supports Fast Charging (i.e. about 2A), not any form of Quick Charge. The chipset supports it, but as Xiaomi have decided not to pay Qualcomm the royalties they charge for QC, it's disabled at a low level in the phone. It might be possible to enable it via custom kernel, but I don't think it's been done yet if so.
dels07 said:
No QC 2.0 support for me, tested with new xiaomi powerbank 10000mAh, ampere show max usb current 500 mAh instead of 2000 mAh. However from measurement I can get 1700-2000mAh so still charging fast enough.
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you mean that from the measurement you're getting a CURRENT reading of 1.700 to 2.000 Amps, right? Because mAh is the capacity measurement while A or mA is the current measurement?
To be on topic, the hardware inside (global version - snapdragon) and the battery support QC v1-3 specs but quickcharge is disabled.
The phone will charge at 1.8A or 1800 mA for about 10 minutes between 20% and 55%. battery capacity.
the current raise up while you changed to a qc 3.0 adapter.
goe2car said:
the current raise up while you changed to a qc 3.0 adapter.
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CURRENT WILL NOT RAISE ABOVE 2A by now. ONLY VOLTAGE WILL BE INCREASE, but with decreasing current.
I tested a bit :
with QC 3 compactible Aukey PA-T16 charger, Ampere shows 2030mA
with Anker 40W 5 port charger Ampere shows 1830mA.
I have a Redmi 4 (standard edition) and I also have a USB Ammeter/Voltmeter which I can use to measure actual voltage and current flow into the device.
Using a standard 2A charger, the device accepts 4.9-5.1v (average 5.0v) at 1.5A (1500ma), and rarely exceeds this due to the voltage drop of the charger circuit /transformer in the wall plug.
Using a Quick Charge 3.0 charger (Capable of 5v, 9v, 12v and dynamically 5v-12v for QC3.0), I was able to charge the Redmi 4 at 6.2v/2.1A. The peak voltage was 6.24V and peak current 2.4A (momentary).
The Redmi 4 will charge at 6.2v and 2.1A with a Quick Charge 3.0 compatible charger when the battery is totally flat. As with all batteries the current slowly decreases as the internal resistance of the battery increases as it charges.
This is 13 Watts of power, 1.7 times higher than the 7.5 watts provided by the included '2A' charger. Thus, while it does not officially have QC3.0 capability, the device is still able to utilise a slight boost from the chipset's compatibility with higher voltages. Realistically, this means you could cut down on the charge time by around 1/3, and even moreso when charging from, for example, 0%-30%.
To power up, you consume Red Bull. But your phone just needs its adaptive fast charger. Rate this thread to express how quickly the Xiaomi Redmi Note 5 Pro can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!
2 Hour With Stock Charger
I didn't completely check the ratings and time but stock charger DOES NOT fast charge this phone. as the Stock Charger isnt QC2.0 Supported. However this mobile does support QC2.0 but you'll have to test QC2.0 Charger 1st. Not all QC2.0 Chargers work on this mobile. Its a little picky. So go to a shop check QC2.0 Chargers on your mobile. when you get circle Sign on notification bar along side battery then it means that device is fast charging. if not then there will be no circle around the charging sign (Flash sign)
also idt this mobile supports QC3.0 but i dont have tools to check amps volts of charger.
Lenovo's original QC3.0 charger doesnt work on this phone. I've tested. but Motorola's QC3.0 Charger works fine.
my rn5 pro , takes apporx 3 hours to charge completely!
So far I'm a bit slow, a little bit more than 3 hours to completely charge the phone. Might have something to do with the cable.
My current charging setup:
- ANKER 5 port 40W
- a docomo USB cable
Planning to buy a proper 20AWG usb cable and a QC2.0 adapter.
I just bought a Letv charger which supported qc3.0 for about 4$ on taobao
I'm currently on the 9.5.11 build and it takes about 4-5 hours to completely charge the device using stock charger, And it took about 2-3 hours while on 9.2 build.
I wonder if the Mi QC 3.0 based charger would improve the situation for us?
piyush95 said:
I'm currently on the 9.5.11 build and it takes about 4-5 hours to completely charge the device using stock charger, And it took about 2-3 hours while on 9.2 build.
I wonder if the Mi QC 3.0 based charger would improve the situation for us?
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Slow charge is a known bug in 9.5.11 build. Wait for an update or change ROM
13,2W for me
I recieved 9.2.13 update yesterday and have been noticing significant boost to charging speeds since then...yet to fully charge from 0 so can't comment on total time but as per Ampere, charging speeds are in range of 1500 to 1700 mah
1000 mA max with 5v 2amp and Work Normal Speed with Stock Charger
Approximately 2 hour for charge phone
I use the app Ampere (free in Playstore) to measure power input and with a normal charger (non QC) it shows up to 1600 mAh charging amount and from almost 0 to 100% it is taking 2,5 hours. One question: is there a way to tell if QuickCharge is active?
@Kusie
Look on your"s phone status bar. With normal charging there is thunder icon next to the battery. With QC active, thunder in in circle as far as I remember. Info about active QC should be also displayed in the bottom of your lockscreen
Sent from my flo using XDA Labs
Using my usb inline meter, i'm getting ~6.5v and ~2.2A, with a Tronsmart usb cable and QC 3.0 Truro charger, screen off and about 44% remaining on battery. Will try when the battery is lower some other time.
takes around 2hours to charge 100% using stock charger..
1h 30min with a Quick Charger from Anker.
Cel00 said:
1h 30min with a Quick Charger from Anker.
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Not possible.
Incogn said:
Not possible.
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Of Course it's true, why should I lie?
Turned off the Phone at 5% and charged it to 100%....
Cel00 said:
Of Course it's true, why should I lie?
Turned off the Phone at 5% and charged it to 100%....
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I have no idea why would you do that... But read reviews, no matter what kind of charger you use, this phone only supports qc 2.0 version. From 0 to 100, in 1 hour, you only get like 55%, and in the end it slows down even more, so yes, impossible to fully charge in 1.5h, TECHNICALLY IMPOSSIBLE. You are either lying, or mixed times and got confused. Judging by technical parameters, the best this phone can do should be around 2hours from 0 to 100.
Incogn said:
I have no idea why would you do that... But read reviews, no matter what kind of charger you use, this phone only supports qc 2.0 version. From 0 to 100, in 1 hour, you only get like 55%, and in the end it slows down even more, so yes, impossible to fully charge in 1.5h, TECHNICALLY IMPOSSIBLE. You are either lying, or mixed times and got confused. Judging by technical parameters, the best this phone can do should be around 2hours from 0 to 100.
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I just posted above that I was able to get QC 3.0 charging rates. Approximately 2.2A (fluctuates +/- 0.1A) and 6.6v (fluctuates +/- 0.2v) using a QC 3.0 charger and Tronsmart cable. Measured using an inline meter, not software.
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.
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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.
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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).
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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.