Develop Bugs

Battery Life at 100%

Hi, My battery used to stay at 100% for at least 20 min with minor use after taking it off the charger. Now, it drops fairly quickly to 97% with the same usage. Overall I think I am left with the same percentage at the end of the day, but I was wondering if anyone else experienced this.

How old is the battery, are you leaving it on the charger for long periods after it's fully charged. Their longevity wears down so it's going to happen. But you can take some steps to stretch it out to the max. Mine goes from 100% to 95-96% in about 30-45 minutes right now
Wicked Stock Rom w/ Stock Kernel. No tweaks

Saintfyre said:
How old is the battery, are you leaving it on the charger for long periods after it's fully charged. Their longevity wears down so it's going to happen. But you can take some steps to stretch it out to the max. Mine goes from 100% to 95-96% in about 30-45 minutes right now
Wicked Stock Rom w/ Stock Kernel. No tweaks
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Thanks, Its about a month old. It is on the charger for at least several hours after its fully charged. Also, I am completely stock.
Just curious, is your device idle in the 30 min that it takes it to go from 100% to 95%? If not are you doing intensive stuff to takes it to 95%?

mikea3000 said:
Thanks, Its about a month old. It is on the charger for at least several hours after its fully charged. Also, I am completely stock.
Just curious, is your device idle in the 30 min that it takes it to go from 100% to 95%? If not are you doing intensive stuff to takes it to 95%?
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Yeah mostly idle, just running back ground tasks and such. Very minimal use.
Also I think leaving it on the charger for long periods of time reduces the life span of the battery as well. That's why it notifies you to take it off when it's fully charged. And I believe I read that somewhere else also.

But also if you leave it charging all night the phone may say 100% however the phone to prevent it self from charging the battery to long it stops charging it and let's it drain from 90% to 100% and slowly charges it back up. So as not to damage the battery. It keeps following that loop to keep your battery running longer so the first 10% can sometimes be misleading but it's nothing to worry about
Sent from my SGH-M919G using Tapatalk 4 Beta

This was fairly common on the SGS2.
The common way to fix it on that device was to charge it to 100%, then unplug it and plug it back in and wait until it gets to 100% again. Do this 3-5 times and the problem should be gone. It is worth a shot on the SGS4
This can happen when flashing ROMs while your battery is not full, though this is not the only way for this to occur.

I like that last one. Gotta try it out.

The kernel stops charging at 100 percent and doesn't start again until it guys 95. What you're reading as your percentage level is not the exact levels
Say you unplug at what you think is 100 percent but in reality it's actually 98 percent, the software quickly relays this back to the user and adjusts the battery levels accordingly making you think it just drained 2 percent really quickly.
The whole reason it does this is to percent over charging the battery. That will greatly shorten it's life cycle or even worse blow up your battery
Sent from my SGH-M919 using Tapatalk 2

Just witnessed my battery fall from 27% to 21% instantly? Is it time to return it?

I've never seen anything like this. My battery literally dropped 6 percent in a split second while I was looking at the %. Is this a manufacturer defect, would a factory reset do anything to help? Please Help.

WackyClash said:
I've never seen anything like this. My battery literally dropped 6 percent in a split second while I was looking at the %. Is this a manufacturer defect, would a factory reset do anything to help? Please Help.
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No, not necessarily. It takes time for a system to properly calibrate the battery. You should always give it a few full charge cycles before assuming you have a problem.

phonic said:
No, not necessarily. It takes time for a system to properly calibrate the battery. You should always give it a few full charge cycles before assuming you have a problem.
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This.
I wouldn't worry about it it likely hasn't calibrated yet, I've seen many of my devices do this, especially new or freshly wiped
Sent from my SGH-I747 using Tapatalk 2

You are overreacting. Large amount of power consumption in short time isn't unheard of. For example, it has been reported that phone searching for connections and syncing everything at once can cause large drops in battery meter. And battery meter isn't always accurate anyway.
If the battery drops more drastically and happens more than a couple of times, then I would worry.

My tablet does the same too it either goes from 78 to 76 or just skips from 30 to 26 randomly

The first day I got it, the battery went from ~50 to ~60. You read that right...it went up without charging. Just let the battery settle and it will become perfectly normal again.

Mine does the same, drop from 33% to 23% instantly. and while charging, it jumps from 94% to 100% too. But i do get 9:30 hrs use time with Chrome.
Still in the return period window, not sure to return it or not.

I think that the battery percentage sometimes freezes and doesnt update right. So once the software finally gets a good reading or update it will suddenly change alot. I had it stay at 85% for like 3 hours and was thinging, AWESOME this is amazing, then 15 minutes later it was at 50% and i was like, oh, damn it was just playing mind games with me.

The battery gauge doesn't really 'know' the charge state of the battery, it's just guessing more or less accurately based on a model of the battery.
It takes things like battery voltage, load, temperature, voltage change with varying load (to estimate internal resistance of the battery) to basically make an 'educated' guess of the charge state. There can be pretty big corrections of that guess - a 10% jump is very normal. It doesn't mean the battery charge state has changed, it just means the battery gauge has corrected it's estimate.

during charging, i seen that it increased 1% per every 4~6 mins from 1% to 94%, then it jumped to 100% from 94% in the next 6 mins.
It also skipped percentage 4~6 times while charging from 1% to 94%, 1% per skip.
I used Batterybot pro to monitor the battery, it will logs when the percentage has changed, that's how i know it was doing this.

Excessive battery drain immediately after unplugging from charger?

So I've noticed some weird battery behavior on my Pixel 2 XL and was wondering if anyone else has noticed this.
I normally like to ;et the battery drain down into 5% or so before plugging it in and letting it charge through to 100%. I started noticing that a full charge would take me nearly 2 hours fully charge. A couple of times last week, I had to step out and the phone was charged approximately 95%. I unplugged the charger and walked to my car (about 5-6 minutes to get to the car) and when I looked at my phone, charge had dropped to 88%. Over the next few days I noticed this kind of excessive drain immediately after unplugging the charger. Aside from this, I still achieve 24+ hrs of battery life on a single charge so I am not sure that it is a HUGE issue, but one I felt shouldn't be happening nonetheless. Last night the same happened - unplugged around 95% and i literally saw the battery indicator go to 93%, 91%, 88% and then stop at 87% in about a minute. I immediately called Google support, shared my screen, and after speaking with the person on the phone - i was told I should definitely RMA, which i did..so I have a replacement coming.
I don't use always on display or always listening and I am extremely good at clearing open apps before I put the screen to sleep. I have noticed this at home, on my wifi as i always need a charge later in the day when I'm home from work. Also, I use the OEM charging wire and brick.
Anyone else notice this ?

I have not noticed battery drain fast after unplugging at full charge level. I would say you probably should RMA the device. Also it is not good to let lithium-ion batteries go down to low levels a lot like that, it will degrade the battery faster. The less you let the battery go down to low levels, the more charge cycles you will have, which means long battery life over time.

raidflex said:
I have not noticed battery drain fast after unplugging at full charge level. I would say you probably should RMA the device. Also it is not good to let lithium-ion batteries go down to low levels a lot like that, it will degrade the battery faster. The less you let the battery go down to low levels, the more charge cycles you will have, which means long battery life over time.
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I definitely did RMA, it was a painless process.
And I always thought that maximizing the charge of the phone (letting it get low, then charging up) would actually keep the battery healthier as it would reduce the # of times I charged it. Am i way off base with my logic for that?!

Going into my third week with my 2 XL and I haven't seen anything abnormal regarding battery drain.
I do practice the method of unplugging at 85% and plugging back in around 15% (per Accubattery's reco, and other reading done online)....
There's no proof that it helps as suggested, and while I realize that only allows me access to 70% of the battery's charge potential, I'm rarely, if ever, away from a plug for more than half a day.
This theory worked well in my 6P until it got the intermittent BLOD... My battery health was around 84% (via Accubattery) after 17 months of pretty heavy use.
Again, not sure it is solid fact or not, but you could always try it for a month and see if there is any noticeable difference in battery drain.

Thank you for that insight! I will absolutely do some research. You're battery health after 17 months is really impressive. I just switched from a Nexus 6p that was definitely showing signs of wear after 2 years of fairly standard use. I hadn't used accubattery, but I will download it on my new replacement and monitor results.
I will say though, that aside from that slight blip i noticed - the battery (andOS optimization i'm assuming) is amazing. I get through a day plus easily. So, anything I can do to keep that consistent or squeeze more time out of it is a no brainer.
Az Biker said:
Going into my third week with my 2 XL and I haven't seen anything abnormal regarding battery drain.
I do practice the method of unplugging at 85% and plugging back in around 15% (per Accubattery's reco, and other reading done online)....
There's no proof that it helps as suggested, and while I realize that only allows me access to 70% of the battery's charge potential, I'm rarely, if ever, away from a plug for more than half a day.
This theory worked well in my 6P until it got the intermittent BLOD... My battery health was around 84% (via Accubattery) after 17 months of pretty heavy use.
Again, not sure it is solid fact or not, but you could always try it for a month and see if there is any noticeable difference in battery drain.
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AceKingNYC said:
I definitely did RMA, it was a painless process.
And I always thought that maximizing the charge of the phone (letting it get low, then charging up) would actually keep the battery healthier as it would reduce the # of times I charged it. Am i way off base with my logic for that?!
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Lithium-ion batteries work on charge cycles and are happier between 50-85% charge levels. You cannot really "overcharge" the battery because the phone will stop charging at 100% and just trickle charge to keep the battery at this level. But unplugging it after full charge defiantly wont hurt. If you keep the battery at higher levels I would't be surprised that you would get 1500+ charge cycl.es out of the phone before any real degradation which should easily get you years of good battery life. I find the battery life on the XL to be awesome and it lasts me throughout the day with still 40% battery life left and that is with pretty heavy usage.

Is this battery behavior normal?

I've noticed that my 2 XL battery drains very fast after full charge, but then settles to acceptable drain rates from about 90%. I'd say it takes less than an hour to drop from 100 to 90% without basically any use. Often I can't even hit 100% when charging. More like 99/98% max. If it does charge to 100%, it stays there for a couple minutes tops, even if just on standby. Which leads me to my next issue...
This prompted me to calibrate my battery which seemed to help somewhat, but I found that I cannot monitor the charge rate when charging while the device is turned off. What is shown is just what "looks like" a full battery charged icon at all times, and the screen does not dim at any point during charge. It actually seems that the phone is frozen during charging when turned off, and needs a very long power button press to turn the phone on. I actually have two Pixel 2 XLs in front of me and they both do this! Is this a known issue?
In general I am getting 5-6 hours screen-on time per charge which seems about right from what I've read. But that initial fast drain and "freezing" while charging when turned off is puzzling. Any common experiences or insight?

nobaddreams said:
I've noticed that my 2 XL battery drains very fast after full charge, but then settles to acceptable drain rates from about 90%. I'd say it takes less than an hour to drop from 100 to 90% without basically any use. Often I can't even hit 100% when charging. More like 99/98% max. If it does charge to 100%, it stays there for a couple minutes tops, even if just on standby. Which leads me to my next issue...
This prompted me to calibrate my battery which seemed to help somewhat, but I found that I cannot monitor the charge rate when charging while the device is turned off. What is shown is just what "looks like" a full battery charged icon at all times, and the screen does not dim at any point during charge. It actually seems that the phone is frozen during charging when turned off, and needs a very long power button press to turn the phone on. I actually have two Pixel 2 XLs in front of me and they both do this! Is this a known issue?
In general I am getting 5-6 hours screen-on time per charge which seems about right from what I've read. But that initial fast drain and "freezing" while charging when turned off is puzzling. Any common experiences or insight?
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It may be that the battery is not fully charged when the phone is telling you it is 100%. When using Accubattery to manually benchmark the battery, I found that my phones were still taking a low charge current (as measured by AB) for 45 minutes to sometimes even one hour after the phone was reading 100%. AB will register 100% when the phone's charging circuit cuts off to zero (and notify you). Using AB for a while will also give you a very close approximation of the remaining capacity of your battery relative to a new battery. When my 2XL was new, I was getting just over 100% (~103%). A year later, it is in the high 90's.

Thanks for the tip on Accubattery. I am going to give that a try for a while. So have you been charging up to 100% regularly in spite of what's recommended by this app?

nobaddreams said:
Thanks for the tip on Accubattery. I am going to give that a try for a while. So have you been charging up to 100% regularly in spite of what's recommended by this app?
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Yes, I turn the 80% alarm crap off and leave it on the charger all night. It is fully charged before I go to bed but I leave it on the charger all night. I use AB for bench marking my battery's capacity and it's real good at that... if you start from when AB says your battery is full. You will see it converge to a % capacity after only 2-3 full discharges. I'm just guessing but I think you are not completely filling the battery to it's full capacity. At least using AB for a while will a) provide you with your battery's true capacity wrt a new battery, and b) will rule out you not charging up fully as your mystery 100-90% quick-drop. Please do report back. :good:

Battery hold from 11% to 0%

Hi all,
occasionally I see my 7 months old Pixel 3a XL can't hold battery power from 11% down. Switches off very fast, abnormally fast. Then if I power it and start it then keeps on restarting until battery level is higher than 5-6%
I use the original charger only. Sometimes it appears, some it does not and I can see it discharges as expected.
I try to keep my battery within 40-100% full and discharge it very rarely to 0%.
Anyone facing those abnormalities? Can't think of connected events - updates, etc ....
Cheers
p.s. after last night happening again, charged the phone from 0% to 86% (phone was off during charge), turned on on 86% and left over night on the shelf. Usually drains 2-3%, this morning it dropped from 86% to 62%. All connections off, nothing unusual shown in the battery usage stats...

TodNex said:
Hi all,
occasionally I see my 7 months old Pixel 3a XL can't hold battery power from 11% down. Switches off very fast, abnormally fast. Then if I power it and start it then keeps on restarting until battery level is higher than 5-6%
I use the original charger only. Sometimes it appears, some it does not and I can see it discharges as expected.
I try to keep my battery within 40-100% full and discharge it very rarely to 0%.
Anyone facing those abnormalities? Can't think of connected events - updates, etc ....
Cheers
p.s. after last night happening again, charged the phone from 0% to 86% (phone was off during charge), turned on on 86% and left over night on the shelf. Usually drains 2-3%, this morning it dropped from 86% to 62%. All connections off, nothing unusual shown in the battery usage stats...
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That's pretty weird
My 3a xl (about the same age as yours) doesn't use more than 10% max when left overnight. Are you using AOD or anything?
Sent from my Pixel 3a XL using XDA Labs

@Skittles9823 nothing beside stock Android and apps that I've used forever. Strange is that it's occasional - also occassional is initial drain from 100% to 92%.
Maybe its time to flash it - nothing suspicious is shown in batt stats
I use the fast charger that came with it. Not sure how it affects battery life long term. I try to keep it 100% to 40% usually and not charge it if not necessary..

TodNex said:
@Skittles9823
I use the fast charger that came with it. Not sure how it affects battery life long term. I try to keep it 100% to 40% usually and not charge it if not necessary..
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I think popular wisdom is that both fast charging and in particular charging to 100% are not kind to the battery's longivety. Divided opinion about the effect of discharging to low percentages. Personally I charge to between 70 and 80% unless I know I'm going to need more capacity. 3a XL has a bigish battery, which helps. I recharge most nights but only to 70-80%. End of day I usually end up between high 40's and low 30's charge.
I manually set all apps I don't actually need to run in background to 'restricted' background use.

I charge mine up to a 100% often, when using it heavy.. I never heard of charging a battery to 100% being bad for it, unless you believe everything that is told or should I say sold to you.. Sounds like a faulty battery. If still under the 1 yr usual warranty I would have it replaced. I have drained mine down to less than 20% and still never experience any issue that OP state.

doubledragon5 said:
I never heard of charging a battery to 100% being bad for it
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Some research references in here
https://accubattery.zendesk.com/hc/en-us/articles/210224725-Charging-research-and-methodology
https://accubattery.zendesk.com/hc/...-Cycle-Life-Modeling-of-Lithium-Ion-Batteries
Also Apple have actually introduced a feature to stop/postpone 100% charging when the phone thinks it's not required. Would be good if we had similar/more control for Android.
https://support.apple.com/en-us/HT210512

WibblyW said:
Some research references in here
https://accubattery.zendesk.com/hc/en-us/articles/210224725-Charging-research-and-methodology
https://accubattery.zendesk.com/hc/...-Cycle-Life-Modeling-of-Lithium-Ion-Batteries
Also Apple have actually introduced a feature to stop/postpone 100% charging when the phone thinks it's not required. Would be good if we had similar/more control for Android.
https://support.apple.com/en-us/HT210512
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I'm still not sold on the idea that charging a battery to 100% is bad.. But thanks for those links.

doubledragon5 said:
I'm still not sold on the idea that charging a battery to 100% is bad.. But thanks for those links.
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It's actually true. Lithium Ion batters degrade over time, the speed of which, depends on the amount of battery cycles they go through (0-100% and vice versa). Others have done the research and the math and found that generally a 20% to 80% and vice versa charge seems to be the best for longevity.
Personally I charge to 100 but try to charge my phone when it gets to 20-30%.
Sent from my Pixel 3a XL using XDA Labs

doubledragon5 said:
I'm still not sold on the idea that charging a battery to 100% is bad.. But thanks for those links.
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Evidence and research is there. Of course you don't have to believe it. It's your phone, your battery, your money

WibblyW said:
Evidence and research is there. Of course you don't have to believe it. It's your phone, your battery, your money
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So very true my phone my money. In all my years of using cell phones, I think I have actually replaced a battery once because it went bad.

Thank you all for the links and the inputs!
One more symptom - when is very low like this morning - 1% and put it in charger - phone shuts off.
I will keep the battery in 40-80% for the future and limit the drain below 40%. I tried to charge it slow with USB - took me like 6-7 hours...
How long it takes you from zero to 100% with the stock charger - looks very fast to me - 0% to 67% in 35 mins
I personally tried to research and could not find what is worse for these batteries - number of cycles (obvious less when used below 40%) or the low capacity usage ?

TodNex said:
Thank you all for the links and the inputs!
One more symptom - when is very low like this morning - 1% and put it in charger - phone shuts off.
I will keep the battery in 40-80% for the future and limit the drain below 40%. I tried to charge it slow with USB - took me like 6-7 hours...
How long it takes you from zero to 100% with the stock charger - looks very fast to me - 0% to 67% in 35 mins
I personally tried to research and could not find what is worse for these batteries - number of cycles (obvious less when used below 40%) or the low capacity usage ?
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The included charger is a fast charger, good for headlining how fast it charges, not so great for the battery. I just use a 'standard' (Anker) USB charger.
Jury's out on if deeper discharge is bad, but it's the number of complete cycles (0-100% counting as 1). So 40 - 80% is 0.4 of a full cycle, and you're not stressing the battery so much by taking it to 100%. Many folk here replace their phones frequently enough not to be bothered by all this - if they sell it when 20% of the battery capacity's gone, that's fine.

I've observed the behaviour and few things made me question myself...one time I can see 13% battery and palying Youtube just shutdown the phone. Put it into charger and started showing 4% as initial charge.
There was another time when using Viber video shutdown in 23% but can be overheat or software bug.
I try to keep it these days above 40% charge but still use the supplied charger till I buy new slower one.

TodNex said:
I've observed the behaviour and few things made me question myself...one time I can see 13% battery and palying Youtube just shutdown the phone. Put it into charger and started showing 4% as initial charge.
There was another time when using Viber video shutdown in 23% but can be overheat or software bug.
I try to keep it these days above 40% charge but still use the supplied charger till I buy new slower one.
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The good news is that this phone seems to be pretty easy to repair and a battery replacement could very well be a good option for you, especially since you wouldn't be compromising any water resistance or anything