Database Users

Some battery thoughts and testings..

Ok, so my battery can go from 100% full charge (overnight) to like 96% within first couple of minutes. I've done the plug/pull trick and it seems to help for a very short while and it will go back to same issue again and again.
Recently, I just bought the $10 2 batteries with external charger pack and had the extra el cheapo battery all charged up using the external charger. To my surprise, I found that the battery charged with external charger drain very accurately.
I've done some testing for a couple of days now by basically draining out the battery and replace it with a fresh one from the external charger without using the wall adapter.
So my thinking is when charging with wall charger, I think the phone does not evenly charges the battery cells because there are so many moving parts while the phone is on and charging. Therefore, it causes the cell to be charged unevenly that leads to quick battery drain.
With the external charged battery, I went from 100% to 90% in 6 hours time with light usage and GPS on.
Give it a try to see if you get different experience with your battery.

I have been doing the same these past couple of weeks (ever since I rooted my 2.2).
My external charger will be here today (it's now saturday morning cst) and I ordered it yesterday. Gotta love amazon one day shipping.
So far I have observed some very interesting charging habits the evo displays when charging with it's included wall charger and stock and extended batteries.

i went 3 days 12 hours and 46 minutes on a single charge, that is with using the stock battery and a regular wall charger, yes i'm rooted and i used setcpu to set my frequency to 614 when screen on, and 245 when screen off, at night when i go to sleep i put the phone into airplane mode, and overall usage was cut back to light to moderate usage, i was trying to see how long i could actually go on the stock battery, and i must admit i'm very impressed.
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I think the general concensus was that the phone doesn't trickle charge. It will hit full then stop charging to a point then will charge again, all while saying 100%
I charged to full then while plugged in it range gps and iheartradio for 20 minutes, unplugged and it dropped to 92 within 5 minutes

Same here. I'll unplug it, browse the web while eating breakfast (about 10/15 minutes) and today I dropped to 89%. But its been two hours since then with some light texting and more browsing im now at 80%.

pinoyxpryde said:
I think the general concensus was that the phone doesn't trickle charge. It will hit full then stop charging to a point then will charge again, all while saying 100%
I charged to full then while plugged in it range gps and iheartradio for 20 minutes, unplugged and it dropped to 92 within 5 minutes
Click to expand...
Click to collapse
granted be the trickle charge is with using the stock usb connecter style wall charger right, i never use that thing unless im connected to the pc, i have a actual regular wall charger that came on another phone i used to have before my Evo, lol.

Update: Yep this morning I replaced my battery that was charged by the external charger that I bought with the bundle and same result. On average, my battery drains at the rate of 1.5% per every hour on light usage with GPS on.
I think from now on, I won't charge the phone using the default charger overnight.

vboyz103 said:
Update: Yep this morning I replaced my battery that was charged by the external charger that I bought with the bundle and same result. On average, my battery drains at the rate of 1.5% per every hour on light usage with GPS on.
I think from now on, I won't charge the phone using the default charger overnight.
Click to expand...
Click to collapse
So you take your battery out at night and charge it with an external charger?

Leaving the battery charging all night is bad for the batteries lifespan, that is why htc and many laptop companies implement this feature.
Stop complaining about it. Its only one cell and it has nothing to do with evenly charging, its regulated by the onboard charging system.
Sent from my PC36100 using XDA App

lehalter said:
So you take your battery out at night and charge it with an external charger?
Click to expand...
Click to collapse
No I have 2 batteries, and I used one of them throughout the day including leaving it overnight uncharged, then in morning I swap it out with the one that was fully charged from external charger.

mastermarc said:
Leaving the battery charging all night is bad for the batteries lifespan, that is why htc and many laptop companies implement this feature.
Stop complaining about it. Its only one cell and it has nothing to do with evenly charging, its regulated by the onboard charging system.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
LOL, I found this statement is bogus because if you don't leave it charged up overnight then what do you do to recharge it? Come on man! Batteries are meant to be charged up over a period of time.
I'm not saying my understanding of uneven charge distribution is rock solid, but at least I backed it up with some of my own studies.

I just always do my overnight charge with the phone OFF.
Sometimes in the morning I'll also do the unplug, re-plug, wait for green trick.
As long as I don't use 4G, my battery life is GREAT.
My 4g consumption is probably worse because I've tweaked the settings to retry more often - default was 5 minutes between retries.
I guess for people that get calls late at night or don't have a home land-line, turning it off at night is not feasable. But it does get around that immediate drop problem.

They charge at a near constant rate until they are full, after that it is BAD to continue topping them off, please do some research on lithium charging techniques as your "testing" clearly hasn't taught you much if anything about the chemistry.
Sent from my PC36100 using XDA App

mastermarc said:
They charge at a near constant rate until they are full, after that it is BAD to continue topping them off, please do some research on lithium charging techniques as your "testing" clearly hasn't taught you much if anything about the chemistry.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Lol you clearly have no idea what you are talking about. The phone doesn't charge at a constant rate until it's full. It would be disastrous for LiCo chemistry if it maintained 0.66C up until it hit 100%. The cell would cook itself to death.
The correct charging profile for the Evo is that it charges constant rate till it hits like 70%, then it slows down until it finally hits 100% and then the charging cuts off. Download JuicePlotter and completely discharge and charge your phone to see this.
Hypothesis below:
The problem with the Evo is that once it hits that cut-off point, the phone never again seems to check if the battery is actually full. (LiCo chemistry has a slight tendency to settle a few hundredths of a volt after charging, and a few hundreths means a couple of %age points when you're in the 4.1V+ range) whereas most cheap chargers will actually keep checking the voltage and trickle charging if necessary.

Too much hassle to keep changing batteries in the Evo, would have to take my case off then the back cover is kinda a ***** and feels like its going to break a tab off or something. The immediate drop doesn't bother me too much. I just use my car charger and it tops me off usually.
Sent from my PC36100 using Tapatalk

Yes, you are right about switching at 70%. Didn't want to complicate things since we got some novices here clearly.
The hypothesis, not so much...as I said before its intentional and it does what it does to preserve the lifespan of the battery. If you paid $10 for a chinese battery, who cares about lifespan, just use an external charger.
Charge it when its off and it gets and stays at 100. Direct evidence that what they did was a feature and not a mistake.
Sent from an evo

I been using the 700 mah charger and I've haven't noticed any difference in performance. Also again I lost 9% carge in the 10 minutes I was surfing while eating breakfast. Oh well. Im not leaving my computer on all night sucking 400 watts or more to charge a 5 watt phone lol. Ill deal with the 10% drain.

Those are the critters under your bed, they use your phone while u r asleep.
Sent from my PC36100 using XDA App

mastermarc said:
The hypothesis, not so much...as I said before its intentional and it does what it does to preserve the lifespan of the battery. If you paid $10 for a chinese battery, who cares about lifespan, just use an external charger.
Charge it when its off and it gets and stays at 100. Direct evidence that what they did was a feature and not a mistake.
Click to expand...
Click to collapse
I build and design Lithium battery based systems for a living. There's absolutely no reason not to top off the battery. The recommended way to charge any Lithium cell is to constant-current charge and then constant-voltage charge up to 4.2V. Once you get to 4.2V, there's nothing wrong with charging it back up if it settles a little. In fact, most chargers don't even "terminate", they just hold 4.2V.
As for your assertion that it is not a bug, did you consider that perhaps the kernel designers are not realizing that there is some kind of parasitic drain on the battery once the kernel thinks it is full?

AzN1337c0d3r said:
I build and design Lithium battery based systems for a living. There's absolutely no reason not to top off the battery. The recommended way to charge any Lithium cell is to constant-current charge and then constant-voltage charge up to 4.2V. Once you get to 4.2V, there's nothing wrong with charging it back up if it settles a little. In fact, most chargers don't even "terminate", they just hold 4.2V.
As for your assertion that it is not a bug, did you consider that perhaps the kernel designers are not realizing that there is some kind of parasitic drain on the battery once the kernel thinks it is full?
Click to expand...
Click to collapse
Just out of curiosity what kinda systems do you build? I have a lithium powered moped (lifepo4 48v 40ah) but i wouldn't say i particularly designed or built (just assembled) the battery system, would be good to have some connections with some real battery specialists for later projects.
In any case, the parasitic drain is an interesting idea but its odd that I can go to sleep, and in the morning my unplugged evo hasn't changed even 1% battery life, whereas it drains from 100% to some odd 90+ number happens when its plugged in. So the parasitic drain would have to only happen when its plugged in for whatever reason.
Some interesting stuff from the wiki.
Charging procedure
Stage 1: Apply charging current limit until the voltage limit per cell is reached.[42]
Stage 2: Apply maximum voltage per cell limit until the current declines below 3% of rated charge current.[42][unreliable source?]
Stage 3: Periodically apply a top-off charge about once per 500 hours.[42][unreliable source?]
The charge time is about three to five hours, depending on the charger used. Generally, cell phone batteries can be charged at 1C and laptop-types at 0.8C, where C is the current that would discharge the battery in one hour. Charging is usually stopped when the current goes below 0.03C but it can be left indefinitely depending on desired charging time. Some fast chargers skip stage 2 and claim the battery is ready at 70% charge.[42][unreliable source?] Laptop battery chargers sometimes gamble, and try to charge up to 4.35 V then disconnects the battery. This helps to compensate for the battery's internal resistance and charges up to 100% in short time.
Top-off charging is recommended when voltage goes below 4.05 V/cell.[42][unreliable source?]
Lithium-ion[which?] cells are charged with 4.2 ± 0.05 V/cell, except for military long-life cells where 3.92 V is used for extending battery life. Most protection circuits cut off if either 4.3 V or 90 °C is reached. If the voltage drops below 2.50 V per cell, the battery protection circuit may also render it unchargeable with regular charging equipment. Most battery protection circuits stop at 2.7–3.0 V per cell.[42][unreliable source?]
For safety reasons it is recommended the battery be kept at the manufacturer's stated voltage and current ratings during both charge and discharge cycles.
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Click to collapse
I'd have to check, but i am nearly certain this is exactly the kind of threshold charging system that you can use with lenovo's battery maximiser. As the wiki sorta explains, topping it off is fine...If you do it very infrequently (500hrs). Continuous charging from all i've ever learned on any chemistry just continues to corrode the plates until they become worse and worse at holding a charge.
No product manual anywhere will ever tell you to leave your charger plugged in for extended periods of time (save for 8hr battery conditioning on ni-cd, also of which it tells you not to do frequently). Storage instructions for lithium example say to leave the battery at about 70% charge. Extrapolating from that we can see that the lesser of the ideals is being completely empty, or too full.
Just my thoughts, much like everyone else i don't have any actual evidence that this was HTC's intention, just seems weird that they would screw something up that's been pretty much the same on the last 20 phones they made. My guess is they didn't.
Edit: oh, and the reason i bolded the military voltage is because that's another (very similar) idea as to what HTC might have done, which is lower the "full charge" threshold for as i suggested before....longer lifespan. But whether the phone ever actually gets to 100% is kinda irrelevant. My point is that its PROBABLY done intentionally to preserve the lifespan of the battery.

Nexus 10 looses battery life when charging

Hey this is a great tablet, but I noticed a bug and was curious if anyone else had this issue? When my screen is on max brightness and charging I noticed the battery will slowly lose charge. This becomes the most obvious if watching netflix or gaming. I hope someone can point me in the right direction of fixing this, unless of course it is a physical limitation of the device.
Edit: I have this problem when charging to a wall outlet, and when connected by usb. I am using the stock samsung charger. I understand the limitations of usb charging through a computer I am more suprised by the AC adapter connected to a home outlet not supplying enough current.
Sent from my Nexus 10 using Tapatalk 2

I have had this problem but only with brightness up and charging via computer.
Sent from my Nexus 10 using xda premium

Search the web I believe I read that this unfortunately is a problem with the device. Maybe it was attack of the show. I know I heard/read it somewhere.
Sent from my NookTablet using xda app-developers app

The Nexus 10 charges pretty slowly, so if it's using more power than it's getting, it's going to go down (though slower than if you weren't plugged in). Computers generally can't supply that much current, and most USB chargers are 1A. The stock charger is 2A, so use that when possible for faster charging.

rp181 said:
The Nexus 10 charges pretty slowly, so if it's using more power than it's getting, it's going to go down (though slower than if you weren't plugged in). Computers generally can't supply that much current, and most USB chargers are 1A. The stock charger is 2A, so use that when possible for faster charging.
Click to expand...
Click to collapse
The thing that you plug into a AC outlet is a power supply not a charger. The charger is in the N10. I've measured it with a current clamp meter and the N10 isn't even asking for half of the 2A that the power supply can deliver.

wptski said:
The thing that you plug into a AC outlet is a power supply not a charger. The charger is in the N10. I've measured it with a current clamp meter and the N10 isn't even asking for half of the 2A that the power supply can deliver.
Click to expand...
Click to collapse
Clamp meters generally aren't that accurate for such low amperage (obviously depends on the meter). In any case, the 2A supply can give enough for the battery to charge and for the device to be used concurrently. It may draw an amp just for charging, but that leaves another amp for the device to be used while maintaining peak charging speed.
This is all speculative, as I'm not 100% that the charging and device power usage is parallel.

Here's an easier way to determine N10 charging power that anyone can do. Get a Kill-A-Watt for $18 from Walmart, and plug the AC adapter into that. This doesn't directly tell you how much current the N10 pulls, but does allow you to infer charging current from the wattage pulled from the wall. You can then compare it with iPad 4 charging graph (in wattage) to determine N10 charging power as a percentage of iPad.
Below we see iPad 4 pulling a constant 13.6W for ~4hr before tapering off. iPad 4 uses the new 12W (2.4A) charger w/ Lightning connector. Assuming 80% conversion efficiency, it's about 10W (2A) going to iPad. iPad 4 averages 5-6hr for a full charge.
http://www.anandtech.com/show/6472/ipad-4-late-2012-review/7
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iPad 4: Battery size = 42.5Whr, charge current = 2A, charge time = 6hr. N10 has 33.3Whr battery, and also averages 6hr. Assuming similar charging power curve, N10 would need to pull 2A * (33.3/42.5) = ~1.6A to achieve same charging time. So a measurement of less than 1A charging current is likely inaccurate, unless measurement was taken at the (tapered) tail end of the charging process.
Note 1: Per Anandtech, iPad also suffers from net-loss charging under heavy use, so the slow-charging issue stems from USB charging's limitation for high-capacity devices.
Note 2: Charging power may also be limited for thermal reasons. N10 already have a thermal throttling problem as it is, and faster charging would make this worse.

rp181 said:
Clamp meters generally aren't that accurate for such low amperage (obviously depends on the meter). In any case, the 2A supply can give enough for the battery to charge and for the device to be used concurrently. It may draw an amp just for charging, but that leaves another amp for the device to be used while maintaining peak charging speed.
This is all speculative, as I'm not 100% that the charging and device power usage is parallel.
Click to expand...
Click to collapse
It's high quality amp meter using its 4000mA range. It's draw less than 1A total, so if the battery is at 80%, it's not charging it as fast as it can. It runs off the battery and the charger replaces the usage. If demand is high, more comes out of the battery than the charger is putting in, not because it can't get it from the PS either.
It could charge twice as fast but the N10's internal charger is slow.

Arg consensus says it's related to an internal charger limitation, no hope of a software fix? Well thanks for the responses.
Sent from my Nexus 10 using Tapatalk 2

e.mote said:
Here's an easier way to determine N10 charging power that anyone can do. Get a Kill-A-Watt for $18 from Walmart, and plug the AC adapter into that. This doesn't directly tell you how much current the N10 pulls, but does allow you to infer charging current from the wattage pulled from the wall. You can then compare it with iPad 4 charging graph (in wattage) to determine N10 charging power as a percentage of iPad.
Below we see iPad 4 pulling a constant 13.6W for ~4hr before tapering off. iPad 4 uses the new 12W (2.4A) charger w/ Lightning connector. Assuming 80% conversion efficiency, it's about 10W (2A) going to iPad. iPad 4 averages 5-6hr for a full charge.
http://www.anandtech.com/show/6472/ipad-4-late-2012-review/7
iPad 4: Battery size = 42.5Whr, charge current = 2A, charge time = 6hr. N10 has 33.3Whr battery, and also averages 6hr. Assuming similar charging power curve, N10 would need to pull 2A * (33.3/42.5) = ~1.6A to achieve same charging time. So a measurement of less than 1A charging current is likely inaccurate, unless measurement was taken at the (tapered) tail end of the charging process.
Note 1: Per Anandtech, iPad also suffers from net-loss charging under heavy use, so the slow-charging issue stems from USB charging's limitation for high-capacity devices.
Note 2: Charging power may also be limited for thermal reasons. N10 already have a thermal throttling problem as it is, and faster charging would make this worse.
Click to expand...
Click to collapse
The AC current drawn by the charger doesn't infer the DC current. I have "AA" charger that charges at 7.5A(not a typo) and it doesn't draw 7.5A AC. I have a car battery charges at 2, 4, 10, 40A and car start at 100A and of course, a normal wall socket is limited to 20A max.
I'll have to check that again at a lower battery level to make it wasn't in the constant voltage part of the charging process.

I measured over 1800mA current draw with the screen on full and 2400mA with full brightness playing asphalt 7
I measured my tablet going from empty to full in 5.5 hours which makes current from the PSU around 1600mA
Looks to be that USB2 can't keep up with the power this tablet can consume when working flat out. Maybe they should have gone with USB3 as that can supply up to 5A

>The AC current drawn by the charger doesn't infer the DC current.
AC current isn't considered; I'm looking only at the wattage and assuming 80% conversion efficiency. We know that USB = 5V, so from there we can infer DC amperage. It doesn't make sense to use a 2+A adapter at less than 50% of its rated output, especially when the charging time is already a long ~6hr. Using iPad as a baseline provides another point of reference, which says that 6hr charging time is probably considered "normal" for this high-capacity category.
>Maybe they should have gone with USB3 as that can supply up to 5A
As said, higher thermal would be a problem for faster charging. The underlying issue is N10's high-res screen, which only the Exy 5 can drive at the time of design, and why the latter was selected (Duarte dude said as much in N10 promo clip). The screen+SoC combo requires more power than can be compensated for, in both its thermal envelope and its charging capacity.
Found the promo clip. Listen at the 9:46 mark, or click on the link:
http://www.youtube.com/watch?v=66-4uMQqerA&t=586

e.mote said:
>The AC current drawn by the charger doesn't infer the DC current.
AC current isn't considered; I'm looking only at the wattage and assuming 80% conversion efficiency. We know that USB = 5V, so from there we can infer DC amperage. It doesn't make sense to use a 2+A adapter at less than 50% of its rated output, especially when the charging time is already a long ~6hr. Using iPad as a baseline provides another point of reference, which says that 6hr charging time is probably considered "normal" for this high-capacity category.
>Maybe they should have gone with USB3 as that can supply up to 5A
As said, higher thermal would be a problem for faster charging. The underlying issue is N10's high-res screen, which only the Exy 5 can drive at the time of design, and why the latter was selected (Duarte dude said as much in N10 promo clip). The screen+SoC combo requires more power than can be compensated for, in both its thermal envelope and its charging capacity.
Found the promo clip. Listen at the 9:46 mark, or click on the link:
http://www.youtube.com/watch?v=66-4uMQqerA&t=586
Click to expand...
Click to collapse
Watts=volts x current. 2A or 2.1A USB power supplies are a common size. Using a overrated PS isn't uncommon.

skally said:
I measured over 1800mA current draw with the screen on full and 2400mA with full brightness playing asphalt 7
I measured my tablet going from empty to full in 5.5 hours which makes current from the PSU around 1600mA
Looks to be that USB2 can't keep up with the power this tablet can consume when working flat out. Maybe they should have gone with USB3 as that can supply up to 5A
Click to expand...
Click to collapse
How did you measuring the current?

I think some of the chargers are defective.
I bought a 3rd party usb power brick and it charges in about 5 hours.
The one that came with it took overnight.

OK what others are saying is that the issue is from the limitations of USB in general unable to exceed 1.8 amps. I guess we have to wait until a decent pogo charger comes out which is rumored to have 2amps. There are 3rd party ones being sold for around 24 bucks on ebay.
Sent from my Nexus 10 using Tapatalk 2

wptski said:
How did you measuring the current?
Click to expand...
Click to collapse
I calculated these numbers from usage data.
battery capacity / hours of use
screen on full brightness
9Ah / 5 hours = 1.8A
Playing Asphalt
9Ah / 3h 40 min = 2.4A
These numbers actually close to double with the screen on around 20% brightness
---------- Post added at 11:39 AM ---------- Previous post was at 10:43 AM ----------
e.mote said:
As said, higher thermal would be a problem for faster charging.
Click to expand...
Click to collapse
There are alternatives. Microsoft managed just fine with a 24w Charger. I suspect it runs at 12V 2A, but can't find any specs
http://www.anandtech.com/show/6385/microsoft-surface-review/9
ASUS also do something similar, using 15 Volts to lower the current and reduce energy lost in heat.

skally said:
I calculated these numbers from usage data.
battery capacity / hours of use
screen on full brightness
9Ah / 5 hours = 1.8A
Playing Asphalt
9Ah / 3h 40 min = 2.4A
These numbers actually close to double with the screen on around 20% brightness.
Click to expand...
Click to collapse
How can you get 2.4A from a 2.0Ah PS?
I retested making sure my battery was low enough, at 80% with it OFF, I got around 800ma. It isn't my meter but there is one posible flaw in my setup though. I'm using a USB extension cord and it may be causing a voltage drop because of the added lenght and skewing the reading.

The voltage drop should be negligible for a USB cable, and any minor deviations should be corrected via regulator in the Nexus 10.

rp181 said:
The voltage drop should be negligible for a USB cable, and any minor deviations should be corrected via regulator in the Nexus 10.
Click to expand...
Click to collapse
Then my max 800ma charging rate is correct and skally's calculations are incorrect??

Dash Charging all the time?

Hello, guys, I need your help because I believe in the community of our forum.
I am wondering about the Dash charging.
1) Is it bad if I use the Dash all the time (every day)?
2) If I use a third party charger, in my case Anker charger (no quick charge), will this affect the system or the internals somehow?
A friend of mine is using 1+3T and he does not like to change his device often but per two years once. And that's why he is using a regular charger without any fast-charging capabilities for a mainly charging solutions. And he uses the Dash Charger really rarely (like once a week), only when he is short on time and needs battery.
I, personally, think that there is good logic in his method of charging his device, but this is only my opinion, I am not acknowledged and that's why I want your help.
What do you think about question 1) and 2) and also about my friend's method of charging.
If I think of another question I will post it later as a comment. Waiting on your replies, mates.

1. It is not. Dash charging keeps all the heat on the brick of the adapter. Your phone is safe.
2. No, it won't affect internals.

OnePlus has put the charging control electronics into the charger, keeping a lot of the heat away from the phone. But as far as my limited understanding of battery chemistry goes, it's not just the heat that ages battery cells, but the higher voltage used to charge them.
While it is impressive to see the phone charging with the Dash charger, it certainly won't help extend the life of the battery. Dash charge can push the limits of charging speed by moving heat away from the battery, preventing the phone from outright overheating, but the battery's chemistry is still put under greater strain from the higher charging current.
Even if it's only the heat that ages a battery, and the charging speed itself makes no difference at all - does the phone actually stay cooler when using Dash charge than when using a regular 5V charger?
Unfortunately OnePlus' marketing materials suggest that you should only charge your OnePlus 5 with the Dash charger, but they're just that - marketing materials. What would you have them say? "Don't use Dash charge too often since it's actually really bad for your battery" isn't exactly confidence inspiring.
The electronics for charging via regular USB, or via USB-C Power Delivery, are all there. Compared to always pushing the battery as close to its limits as possible, I cannot see the slower charging modes being worse for your battery life.
I use the Dash charger only when I have very limited time to charge my phone. When I regularly charge my phone over night, I do that as slowly as possible using a regular 5V charger. I wouldn't mind the phone taking six hours to charge overnight.

Speaking of charging, can we use quick chargers 2.0 with this phone? Does it charges quicker?
I have an Aukey quick charge 2.0.

NetSoerfer said:
I use the Dash charger only when I have very limited time to charge my phone. When I regularly charge my phone over night, I do that as slowly as possible using a regular 5V charger. I wouldn't mind the phone taking six hours to charge overnight.
Click to expand...
Click to collapse
I follow the same approach. I charge my OnePlus 5 every night with the charger of my "old" OnePlus X.
A couple of weeks ago I charged it every second or third day, and waited always till the battery is almost empty.
After I read the information provided by this XDA thread and the additional information in this article. I decided to limit the capacity and charge it every day.
So my battery is swinging about between 30% and 80%.
When on travel or time is limited I use dash charge.

dima-82 said:
After I read the information provided by this XDA thread and the additional information in this article. I decided to limit the capacity and charge it every day.
So my battery is swinging about between 30% and 80%.
Click to expand...
Click to collapse
This is actually awesome, being able to limit charging to an arbitrary percentage. I don't have root yet, but this one is definitely bookmarked.

NetSoerfer said:
This is actually awesome, being able to limit charging to an arbitrary percentage. I don't have root yet, but this one is definitely bookmarked.
Click to expand...
Click to collapse
As soon as the battery reaches 80% the BatteryChargeLimit Service stops charging and starts it again if the battery falls beyond 77% (The values are adjustable).
While charging (connected to charger) and waiting (connected / disconnected) till the lower threshold is reached a notification with the current voltage and battery temperature is shown.
We can cheat the electronic and move the charging logic to the charger, but we still have the physical and chemical constraints of batteries. So I thing this is a acceptable way to keep the battery as long as possible in a good condition.

NetSoerfer said:
OnePlus has put the charging control electronics into the charger, keeping a lot of the heat away from the phone. But as far as my limited understanding of battery chemistry goes, it's not just the heat that ages battery cells, but the higher voltage used to charge them.
While it is impressive to see the phone charging with the Dash charger, it certainly won't help extend the life of the battery. Dash charge can push the limits of charging speed by moving heat away from the battery, preventing the phone from outright overheating, but the battery's chemistry is still put under greater strain from the higher charging current.
Even if it's only the heat that ages a battery, and the charging speed itself makes no difference at all - does the phone actually stay cooler when using Dash charge than when using a regular 5V charger?
Unfortunately OnePlus' marketing materials suggest that you should only charge your OnePlus 5 with the Dash charger, but they're just that - marketing materials. What would you have them say? "Don't use Dash charge too often since it's actually really bad for your battery" isn't exactly confidence inspiring.
The electronics for charging via regular USB, or via USB-C Power Delivery, are all there. Compared to always pushing the battery as close to its limits as possible, I cannot see the slower charging modes being worse for your battery life.
I use the Dash charger only when I have very limited time to charge my phone. When I regularly charge my phone over night, I do that as slowly as possible using a regular 5V charger. I wouldn't mind the phone taking six hours to charge overnight.
Click to expand...
Click to collapse
That is why dash charging only matters from zero to 60%. After 60% it reduces the speed of the charge at 75% then again then again at 85% and again at 95%. It's not all about the heat but one the battery is at a certain level, you can't charge at the high speeds as that causes instability in the chemical reaction. Even QC quick charge slows down as well.

gonsa said:
Speaking of charging, can we use quick chargers 2.0 with this phone? Does it charges quicker?
I have an Aukey quick charge 2.0.
Click to expand...
Click to collapse
You can use any charger that supports 5v output. a qc 2.0 or 3.0 charger in this case acts like a regular charger.
the difference between quickcharge and dashcharge is that a qc increases the power through a higher voltage with lower current whereas a dc uses lower voltage with higher current.

1) Using the dash charger every time will not harm the battery or reduce its lifespan in a notable way. First of all, you only get dash charging speeds until the battery reaches 60% once there the charger reduces the output and yet again at 75% and 85% of battery capacity. This is to prevent over voltage of the battery cells which is one of the two main factors in reducing battery capacity and lifespan. The other factor that hinders battery capacity and lifespan is temperature, however, dash chargers use a nifty trick to reduce battery temperature when charging, the adapter converts the power to the battery's voltage instead of leaving the power conversion to the phone itself, this helps the phone stay cooler when charging which helps with the battery lifespan.
The one thing that you shouldn't do is keep the phone plugged in after fully charging the phone or leaving the phone charging overnight. Having the battery at 100% capacity for too long will keep it at a very high charge voltage which will reduce the amount of charge cycles of the battery. The best range to keep a Li-ion battery for a long lifespan is between 60% and 95% capacity.
2) You can use any type of charger on the 1+5 as long as it's a 5V charger. However, you won't get the charging speeds dash charger offers and since those chargers don't handle the power conversion, your phone will have to which means it might heat up a little bit more than with the dash charger.

1) ofc not.
2) no.
Will i believe the sweetest thing in this phone is about the fast charging time (Dash)
like i have my OP3 for a year now and i only use the Dash charger with it
even tho the battery still good for me

Cmon !, YES it will.
This is not a magic box people, Lithium Polymer batteries will react just like other lithium based batteries : in fonction of temperature, number of time of polarity change, load usage, and time.
This is a chemical reaction, you'll have oxydation: speed and quty in fct of previous factors. you can find a ton of info about this online, or in school.
So far a good battery that can take huge charges are Li-Fe, but the capacity is lower.
Those mobile phones batteries are good, but you will decrease their life under 20 W (5v @4A) load charge for sure !
This as been said, I know that op5 will regulate, but at the highest power that the battery can take, wich is always too high to make your phone last long with the maximum capacity you can get with a good maintenance.
I'll recommend more like 2.1, or personnaly, 1.2 A charger. Do not go lower, you'll have other issue, like crystallization.
I can explan in more scientific method, since I worked on electric race cars, but this site will explain the essentials.
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
Is this a big noticable difference in your everyday usage ?? No, I don't think so. You'll see the difference in 5-6 years, when the phone will be slow and the cpu will max out, and you'll do 6 hours on a 1200 mAh battery capacity since the maintenance was bad.

A couple of days ago I installed Charge Monitor (thx @waterdaan) and monitored the charging curve with different chargers on my OnePlus 5.
Here the results:
OnePlus Dash Charger, 36% - 97% in 56 minutes:
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Charger from OnePlus X (standard 5V/2A USB charger), 33% - 93% in 79 minutes:
This confirms, what in this thread was already mentioned by some users. Dash Charger reduces the current at certain capacity levels.
So I think we are good to go with the dash charger and shouldn't worry that it harms our batteries.
Additionally I checked other battery apps and found Battery Warner by @P1xelfehler which can also be found on the PlayStore. This app tries to combine the capabilities of Charge Monitor and Battery Charge Limit but is less powerful as the other two.
My conclusion is: I will use the Dash Charger and Battery Charge Limit to keep the capacity between 30% and 80% for the normal daily use.
To monitor the charging process one of the above mentioned apps above is a must have. Almost all apps on the market, which promise you to extend battery life (Battery Doctors, Battery Savers, Battery Boosters, you name it...) have no effect at all and may even damage your battery.
If my assumptions are wrong, please correct me

dima-82 said:
If my assumptions are wrong, please correct me
Click to expand...
Click to collapse
I use the dash charger cause as for me the current looks more stable than while charging with other chargers as shown in your example.
Btw I'm using Charge monitor as well, very good app

oVeRdOsE. said:
I'll recommend more like 2.1, or personnaly, 1.2 A charger. Do not go lower, you'll have other issue, like crystallization.
Click to expand...
Click to collapse
Then, do you recommend to use a 1.2A charger through the night?

Charging speed

To power up, you consume Red Bull. But your phone just needs its adaptive fast charger. Rate this thread to express how quickly the Google Pixel 3 can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

The Pixel and Pixel 2 used to charge "fine" through a PC port. The pixel 3 charges extremely slowly. For example my Pixel 2 would be at 50% battery and using the USB port on my car it would be close to 90% when I got home. Under the same situation, the Pixel 3 would only be at 55%. Same problem using the PC port. I know I know it's NOT supposed to be fast charge but I am only stating the facts and differences. Stock charger charges fine.

Pixel 3 charges very slowly on my existing 2.4A (per port) multi usb charger. Clearly it's not a PD charger, but it always provided enough juice for my nexus 5x to charge quickly. Clearly the pixel 3 doesn't like it.

Can confirm this also. Ampere indicates that it pulls less than 200mA on any non-USB type C charger. This is different from my previous Pixel 2.

With Samsung fast wireless charger, s9 goes from 20%to 100 in less than 2 h, pixel 3 charged only 25% in 2 h....... Charging speed is awfull if you don't use Google chargers

nondoB said:
Can confirm this also. Ampere indicates that it pulls less than 200mA on any non-USB type C charger. This is different from my previous Pixel 2.
Click to expand...
Click to collapse
Something is not right there. I see around 1000 mA with an old 1.0A charger and around 1300 mA with various 2.4A ones. Even with 'slow' wireless I see 500-600 mA
Sent from my Pixel 3 using XDA Labs

With Nov security update. No improvements. It charges fine with pd charger but insanely slow with any other.

My Pixel 3 charges plenty fast for me. Although, I typically use my Dell Latitude 20v (45W) PD charger.

piccit said:
Something is not right there. I see around 1000 mA with an old 1.0A charger and around 1300 mA with various 2.4A ones. Even with 'slow' wireless I see 500-600 mA
Sent from my Pixel 3 using XDA Labs
Click to expand...
Click to collapse
I'm not an expert at this stuff and certainly might be missing something but charging at 1000mA from a 1A charger should be physically impossible. Wouldn't that be 100% efficiency?

Yup.. Charging is too slow.. Infact, the charging time estimated (which is shown on the lock screen when the phone is being charged) is also wrong.. May be it gets adjusted over time...

tranquill1800 said:
Yup.. Charging is too slow.. Infact, the charging time estimated (which is shown on the lock screen when the phone is being charged) is also wrong.. May be it gets adjusted over time...
Click to expand...
Click to collapse
The estimate is adjusted over time. To my knowledge, all fast charge technologies are able to charge much quicker when the battery is low, but then slow the charge down as the battery approaches a fully charged state/heats up. The estimate would simply be a guess, since they likely are, app status, ambient temperature and battery condition dependent.
This can be seen in the graph on xda's quick charging comparison. Note that all the technologies start out quite fast but eventually taper off. Also note that USB-PD is the slowest (most conservative) of the technologies after the battery gets to about %40 charge.
https://www.xda-developers.com/charging-comparison-oneplus-huawei/
I would add that my new pixel 3 does appear to charge a little slower than some of my previous devices, however I've got several devices that use USB-PD so the versatility of USB-PD and ability to use one charger across my devices more than makes up for the extra 30 minutes or so of cellphone charge time. Guess everyone's expectations are different.

"Fast charging" on the Pixel is via Power Delivery. This is only possible over USB-C; PD can negotiate higher charging rates by increasing the voltage. This is not possible with PC type A ports; type A is rated for 5v, 3a max.
Qualcomm Quick Charge does adjust voltage and uses type A ports, but it uses the data pins for rate negotiation, while PD uses pins unique to USB-C.

jimv1983 said:
I'm not an expert at this stuff and certainly might be missing something but charging at 1000mA from a 1A charger should be physically impossible. Wouldn't that be 100% efficiency?
Click to expand...
Click to collapse
No. The charger is able to deliver 1000mA, but the total power delivered to the device will be less than it draws from the mains supply (the difference wasted as heat).

Powergreb said:
The Pixel and Pixel 2 used to charge "fine" through a PC port. The pixel 3 charges extremely slowly. For example my Pixel 2 would be at 50% battery and using the USB port on my car it would be close to 90% when I got home. Under the same situation, the Pixel 3 would only be at 55%. Same problem using the PC port. I know I know it's NOT supposed to be fast charge but I am only stating the facts and differences. Stock charger charges fine.
Click to expand...
Click to collapse
Exactly. Google has really messed up the charging speed. Pixel2 used to be fine with usb ports. Pixel3 charges faster only with stock charger with which it came.
Sent from my Pixel 3 using Tapatalk

David Horn said:
No. The charger is able to deliver 1000mA, but the total power delivered to the device will be less than it draws from the mains supply (the difference wasted as heat).
Click to expand...
Click to collapse
Yeah, that's what I thought but the comment I replied to said it was charging at 1A from a 1A charger. I would expect maybe 800mA from a 1A charger.

jimv1983 said:
Yeah, that's what I thought but the comment I replied to said it was charging at 1A from a 1A charger. I would expect maybe 800mA from a 1A charger.
Click to expand...
Click to collapse
Yeah idk if I just mixed up my numbers (I had been testing multiple charges) or what. Tried again and it averaged more around 600
Sent from my Google Pixel 3 using XDA Labs

The phone doesn't like to charge fast if the battery tempeturature is "high" (higher than 35 ºC). It's just a very agressive charge trhottle. Try charging again but in a colder weather or room.
It was my experience.

The charger that comes with the phone is not fast charger?
Got my phone yesterday and when I charged it, it said it's slow charging....
Edit
Second charge was fast charge according to info on screen.

After Dec update, the PC port charging is normal, not rad, not slow but normal. Problem fixed.

Wireless charging speed
Powergreb said:
After Dec update, the PC port charging is normal, not rad, not slow but normal. Problem fixed.
Click to expand...
Click to collapse
I felt similar way until today. But today at around 20% battery I put my Pixel 3 at Pixel Stand and have got that:
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I already posted regarding strange behavior of wireless charging: https://forum.xda-developers.com/showpost.php?p=78315849&postcount=73:
Before I've got original Pixel Stand, I used generic wireless charger. No surprises, it chargers P3 slowly. But there is more. Sometimes it doesn't charge P3 at all. Way more strange, that almost the same behavior I have with Pixel Stand. After some days I began to suspect there is a regularity - the charge at full speed works with at least 85% of charge at phone. If the charge is lower, the possibility the charge would be at rapid speed is pretty low. It can claim it charges rapidly, but in fact it doesn't charge at all, since the charge is going down at the same rate as phone out of any charging. I definitely have relatively small statistics and can not say for sure that 85% is a "red line" for triggering wireless charge start (regardless of speed in my case). Today even at 91% phone battery wireless charging at Pixel Stand didn't start at all (with "charging rapidly" announcement at screen and slowly discharging phone). Other functions of Stand work pretty good regardless of what's going on with charging. I didn't contact Google Customer Service since the results are unstable.
Click to expand...
Click to collapse
In case of regular charging through the USB-C cable from native Pixel charger I've never had any problems. But wireless charging even with original Pixel Stand doesn't look good. At the generic charger even after Dec update charging goes south - not charging at all or with original Google wireless charger just like at screenshot - rapid charging in day and a half. It's better, than no charge, but for $79.99 for original Pixel Stand it has to be faster.

Charging speed

To power up, you consume Red Bull. But your phone just needs its adaptive fast charger. Rate this thread to express how quickly the OnePlus 7 Pro can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

The battery life could be better, but the charging speed is amazingly fast!

The charging speed is tremendous fast.

Fast as hell (fist charge after factory here starting at 13%, end at 94%) - much much faster compared with Galaxy note 8 and my ancient Sonny z5p.. a beast (btw, as advertised - no heating at all - at around 27c room temp)

I get about 5,2 A using the stock charger
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Gesendet von meinem GM1913 mit Tapatalk

Advertising warp... 50 percent in 20 min.... Max i managed to get is around 37 to 39 percent, Oneplus misleading again?

misiokicio said:
Advertising warp... 50 percent in 20 min.... Max i managed to get is around 37 to 39 percent, Oneplus misleading again?
Click to expand...
Click to collapse
Mine too. 90% in 1 hour. 20mins 91-100%.
Sent from my GM1910 using Tapatalk

misiokicio said:
Advertising warp... 50 percent in 20 min.... Max i managed to get is around 37 to 39 percent, Oneplus misleading again?
Click to expand...
Click to collapse
No.
0 to 50% in 20m. That's it. It's not 50% in 20m.
BTW, at least half a dozen tests on YouTube. Pretty easy to confirm.

My battery heats up to 42 degrees C while warp charging, and I don't like that; the upper threshold for LI-Ion bateries where damage starts to occur is at around 45 degrees , and it's way too close for comfort.
Luckily I have my handy-dandy dash charger from op3t and I'm using that for now. It charges at 3.4A until 80% and after that it's identical to the warp charge; and the best part, it doesn't go higher than 36 C.
If you do a quick math, 80% of 4000mah is 3200 so, in almost an hour the phone is at 80%, that means it takes around half an hour to get to 40%. I can live with that difference at the cost of keeping my battery in shape.

Most recently I came from a Moto G6 that has rapid charge and I thought it was pretty good. One Plus p7 stock charger kicks A** fastest charge I've ever had!!

Wonder if charges faster in airplane mode? That's I've always charged all my phones when I NEED that quick battery charge

Obviously the less you have in use while charging, the better; that's for any phone. Best speeds achieved when phone is off and you're charging.
My experience has been great. Realize also for battery protection that once the Li-Ion battery gets to 80%, it purposefully slows the charge rate down.

matze19999 said:
Could be better, but the charging speed is amazingly fast!
Click to expand...
Click to collapse
Could be better? Try out an iPhone XS Max for just one day and you want to die. It needs like 3 hours to fully charge and Apple users are okay with that.

memocatcher said:
Could be better? Try out an iPhone XS Max for just one day and you want to die. It needs like 3 hours to fully charge and Apple users are okay with that.
Click to expand...
Click to collapse
Ooops, I meant the battery life

Charging speed chart + temperature
I created two simple charts presenting the charging speed with WARP Charge and without where the second chart shows the temperature rise during charging. During both measurements the phone was switched on without any restrictions (e.g. background processes were running normally, Wi-Fi and BT were on, etc.). I pointed out the peak temperatures on the temperature chart. The "standard charging" means that the phone was charged with a standard 12 W charger (5 V / 2,4 A). I hope that some of you guys will find it useful.

I wonder why some users can charge their 7 Pro within 60 Minutes from 0-100% (saw many YouTubers), whereas others (like me) need 80 minutes to charge it from 0-100.
Even when the phone is powered off.

Godecki said:
I created two simple charts presenting the charging speed with WARP Charge and without where the second chart shows the temperature rise during charging. During both measurements the phone was switched on without any restrictions (e.g. background processes were running normally, Wi-Fi and BT were on, etc.). I pointed out the peak temperatures on the temperature chart. The "standard charging" means that the phone was charged with a standard 12 W charger (5 V / 2,4 A). I hope that some of you guys will find it useful.
Click to expand...
Click to collapse
Nice work!
memocatcher said:
I wonder why some users can charge their 7 Pro within 60 Minutes from 0-100% (saw many YouTubers), whereas others (like me) need 80 minutes to charge it from 0-100.
Even when the phone is powered off.
Click to expand...
Click to collapse
I haven't tried going from 0%. I can't resist putting a little charge on it if it gets below 30% or so.
I do think the only thing faster than this that I've personally experienced was the mate 20 pro.

memocatcher said:
I wonder why some users can charge their 7 Pro within 60 Minutes from 0-100% (saw many YouTubers), whereas others (like me) need 80 minutes to charge it from 0-100.
Even when the phone is powered off.
Click to expand...
Click to collapse
For me it's the same, 0-35% in 20 minutes, 0-50% in 30 minutes, 0-100% in 80 minutes

I have got a usb type c to type c 3.1 gen 1 cable. heard that, usb power delivery 15W (5V *3A) is enabled in one plus 7 pro. So I tried connecting op7pro to my laptop's thunderbolt 3 port.. but, charging speed was around 1700mAh only, as compared to expected 3000mAh.
Warp charge is lightning quick! Often reads 5850mAh!!
Any thoughts on this?

Quick Charger,fast and amazing