Develop Bugs

dud battery?

Hi all,
I know this issue has been kicked to death but I'd like to get some opinions. I've searched and read through numerous threads about the tp2's battery and some are extremely happy with their battery life while others are not.
Just today I was talking on my tp2 for 5 mins and the battery went from 98-99% to 91%. This was around hr after I had unplugged it from a 7hr recharge (went from 50% to 100%). This would mean I have a talk time of 50-60 minutes, which doesnt seem right.
Typically, I get down to 40-50% in a day after heavy data usage (google maps, internet browsing) with no phone usage.
I've installed maybe 10 tweak cabs/programs and I've made sure s2u2's display mode is set to rawbuffer.
Thoughts?

Is your battery/device new? The battery needs a couple recharge cycles to reach optimal capacity...

have had it for 4 weeks now. Are we talking about 0 to 100% when you talk about recharge cycles?

I wouldn't worry too much. I find that when the battery capacity is above 90%, the readings are not very accurate. I've sometimes experienced a drop of 6 or 7 percent over a span of a few minutes and sometimes, it's stuck on 99 or 98 percent for an hour of usage.
I use my device heavily during the day and it gets down to about 40% at the end. So, that's pretty much in line with what you experience.

Anker Battery ok to charge overnight?

I notice the "tips" to use it to charge it to 95% MAX, and use it to no less than 5%. Are these claims true? I have no problems of re-charging it before the 5% mark, but to constantly keeping an eye on the phone while charging it can be tedious and annoying.
Anybody can shed some light my way regarding this subject?
Thank you!

Well, your anker lipo would feel better (and any other lithium polymer battery for that sake) if you would not do full cycle every time. Full cycle means you goes from full to empty charge/discharge. (95 down to 5% counts almost as a full cycle)
Say chemistry in lipo can make 200 full cycles before 20% capacity lost or 500 half cycles (like from 100 to 50% and then recharge to 100%). See the difference, longevity will be bit better with half-cycles.
If you store lipo for prolonged period of time (like month) then don't charge it to 100% but to 50%.
And don't keep your phone in high temp zones (like in a sun in the car) this will kill lipo in no time.
Other then that just enjoy your anker. It's cheap enough to replace it in 500 half-cycles (which might be translated to couple years)

Thanks for the response! From the way you describe it, it sounds very familiar with how my lipo batteries for my rc cars work.
I usually charge my phone at 30% mark to fully charge. So, given that, it'd be ok for me to charge it overnight (to 100% then trickle charge until morning), and let it discharge to 30 - 40% then recharge.

Phone will stop charging lipo when it reaches 4.2V so there is no problem to over-charge it... keep it on a charger overnight.
I do one full cycle about once in month but this is for different reason.
Usually, I can go from 100% at morning to 40% at evening in two days. Then recharge it overnight. I think my Anker 2200mAh will outlast my SGSII.

battery observations w/ questions

So I've been running some random tests with my battery and usage to try and figure out how this thing maintains charge and such. I'm running rooted stock TW 4.1.1 with Juice Defender.
1. Usually, I charge the phone overnight while I sleep, then when I unplug it, it drops down to 99% immediately. Lately, it's been dropping down to around 96% in 45 minutes of no use then leveling off. This is with a new battery that replaced another one right after the Jellybean upgrade as I thought my battery was busted.
2. I usually get about 12-14 hours with 2.5-3hrs of screen time (I get crappy service where I work and the phone is in airplane mode when not in use, and when in use, it has bad service).
3. This weekend, I didn't charge it over Friday night and let it die Saturday morning. Then I charged it for about 3 hours or so and ended up getting about 34ish hours with 3.5 hours of screen time out of it (using wifi and better network since I'm at home).
4. I charged it overnight last night (about 9 hours) and when I unplugged it, it dropped to 98 immediately, then 30 minutes later it was down to 96 again.
With all that said, I'm thinking that I probably should not be charging my phone overnight at all anymore. The only problem with that is that I don't have enough time in the morning to charge it before work and I can't charge it while at work as I move around all day.
Will I wear my battery down more by not fully charging it and using it throughout the day and only charging it when I can? I've read that battery website that people post constantly where they talk about how the new batteries stop charging after a certain period of time, but if that were the case, why would I get better battery service from only charging for 3 hours then leaving it overnight?
I know there are a million battery threads on here and we probably didn't need another one, but i thought I'd try to create one with a bit more substance than "oh i get 6 hours with 5 hours screen time on such and such a ROM". I'm more interested in the physical methods than the software methods for getting the best out of the battery.

The quick drop off in battery charge is probably partly due to some hysteresis that has already built up. There is a lag time between the voltage demand on the battery and the battery's ability to deliver the required current. Energy is lost during this lag time.
I posted this another forum so I am recycling but it is relevant.
Some general guidelines when charging Li-ion batteries:
A slow charge is preferable because it reduces heat and hysteresis. Heat of any sort decreases the overall life of the battery. Hysteresis reduces the performance of the battery in the discharge state causing a quicker plummet in battery charge from 100%. (NiMH batteries are worse with hysteresis, but Li-ion cells suffer from hysteresis also).
Unplug the charger as soon as possible when the battery is fully charged.
Lithium ion cells however can not tolerate overcharging or overvoltage and the charge should be terminated immediately when the upper voltage limit is reached.
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Do not use charging pads or mats as they introduce more heat.
Pulse chargers do the best job because they give the battery brief rest periods to allow the chemicals to settle and accept the charge with reduced hysteresis and heat.
A memorable though not quite equivalent phenomenon is the pouring of beer into a glass. Pouring very quickly results in a lot of froth and a small amount of beer at the bottom of the glass. Pouring slowly down the side of the glass or alternatively letting the beer settle till the froth disperses and then topping up allows the glass to be filled completely.
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Depth of discharge. Consistently letting the battery run down to very low reduces the overall lifetime. It is better to minimize the depth of discharge by topping off when convenient than running it down completely.
Similar to a mechanical device that wears out faster with heavy use, so also does the depth of discharge (DoD) determine the cycle count. The shorter the discharge (low DoD), the longer the battery will last. If at all possible, avoid full discharges and charge the battery more often between uses. Partial discharge on Li-ion is fine; there is no memory and the battery does not need periodic full discharge cycles to prolong life, other than to calibrate the fuel gauge on a smart battery once in a while.
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Can't yet post direct links
Battery University . Com
mpoweruk . com / chargers . htm

gotcha. so i shouldn't be charging it overnight anymore. thanks for all that other info, too. very useful to know.

[Q] Last few battery discharges my tablets gone off at 3%

its not that old, maybe 6 months old, about the last 3 times that my battery has nearly fully discharged, its not got all the way to 0% and has been going off at 3% but then when i plug the charger in and turn the tablet back on the battery shows as 0%
i also noticed the other day it was at about 4% battery and i wa son a pool game, the screen started flickering on and off, and then it turned off, not sure if that's just because it was on the very end of the battery, but was still around 4% anyway so should have been ok till 0%?
any ideas if i have something wrong or is it normal?
James

The tablet will shut off once the battery is depleted. Anywhere under 10% is normal. Letting your device run that low is hard on the battery and will reduce its lifespan.
Read this: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

The battery meter is not even remotely as accurate as you expect it to be. Its just an estimate of battery voltage versus how you are using the device. Don't expect it to be accurate to within a few percent, or even 5-10%.
Heck, I've had some devices show a drop of 20-30% and shutoff. Probably just some metering error, and it didn't happen often. But that tells you how inaccurate the meter can be.
As another mentioned, deep cycles are not good for the long term life of Li ion batteries. Charge fully and frequently.

Charging Cycle?

Hey its been a few days since ive received my one plus 5t. Wanted to know what are the typical charging cycles you guys use. Do you guys charge when battery is below 5 and stop at 100? or something different.
i am aiming to use this phone for about 3+ years so would be great to know how can i maximize my usage in this duration.

jelousdogs said:
Hey its been a few days since ive received my one plus 5t. Wanted to know what are the typical charging cycles you guys use. Do you guys charge when battery is below 5 and stop at 100? or something different.
i am aiming to use this phone for about 3+ years so would be great to know how can i maximize my usage in this duration.
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Click to collapse
you can charge your device pretty much at any time just don't let it drain to 0% (shut off condition) as that'll theoretically deteriorate the battery in the long run. I had a wrong perception that charging the phone from 0-100 and discharging back to 100-0 will make the battery last a little longer ( tried it with my moto e and moto g which eventually started giving me random shutdowns at 20-25% juice left) which is totally opposite of what you should do. With the 5t I usually put it on charge around 15 and then straight to 100 or around 70 when I'm in a rush.

I typically charge when the battery is around 20 - 30% and I have an app to stop charging when 60% is reached. According to Battery University it's best to keep between 30% to 60% but of course practicality has to come first. 60% upper limit has worked pretty well for me as I can usually charge my phone when needed.
https://forum.xda-developers.com/android/apps-games/root-battery-charge-limit-t3557002

There are two factors killing a battery: heat and voltage. A lot of heat (over 30°C) will degrade the lifespan of your battery.
High and low voltage can degrade it too. The optimal voltage would be around 4.05 V. Anything higher degrades it and anything far too low (under 3.5 V or so) can even make it non operational without a high current "boost" to make it usable again. However, lithium batteries tend to charge to 4.4 V which is good for battery life but bad for the lifespan.
In short you should not keep your phone at 100 % over a long period of time and never discharge it completely. Heat and voltage induced by fast charging is also bad (faster charging means higher voltages of a few 100 mV).
I'm using Magisk and the Magic Charging Switch module to charge it to 90 % and only charge it at 80 % again. At night I lover it to 80 % and 70 % and 45 minutes before I wake up it is charged to 100 % making the battery only use the max voltage for 1 to 2 hours instead of the whole night.
Leaving the phone plugged in wouldn't hurt it im terms of cycles etc. but the constant high voltage does hurt. More information can be found here. Really worth a read: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries