Database Info

Why does the battery % drastically drop upon a reboot?

Example: my battery says 50%, I reboot, and now it's down to about 40%.
What's the deal? Anyone else have this problem?
I'm running Das BAMF 1.6.2, stock kernel.

I've noticed since I got the tbolt day one. Im in the 15% range when reboot. My screen freeze after lightning strike for 3 minutes. Was hoping the new update would fix it but update now delayed. Never again will I be the first in line for phone.
Sent from my ADR6400L using XDA Premium App

The percentage drops but it stays at whatever that percentage is for an hour or five depending on how much I'm using my phone.

because your battery gauge is lying to you and not reporting accurately prior to reboot.

dbisch said:
Example: my battery says 50%, I reboot, and now it's down to about 40%.
What's the deal? Anyone else have this problem?
I'm running Das BAMF 1.6.2, stock kernel.
Click to expand...
Click to collapse
Thought I had commented on this, whoops.
So have you calibrated your battery since flashing 1.6.2?
If not you need to do so, as this will fix your issue, and help your battery life.

nosympathy said:
Thought I had commented on this, whoops.
So have you calibrated your battery since flashing 1.6.2?
If not you need to do so, as this will fix your issue, and help your battery life.
Click to expand...
Click to collapse
What do you use to calibrate it? Wiping the battery stats?

Check out this thread: http://forum.xda-developers.com/showthread.php?t=871051
Basically the meter is lying because keeping your phone at 100% while charged is not so good for long term life of the battery. So once you get a full charge it doesn't keep the battery full, and when you take it off the charger the meter quickly catches up to reality.
So don't worry, it's supposed to happen this way.

nosympathy said:
Thought I had commented on this, whoops.
So have you calibrated your battery since flashing 1.6.2?
If not you need to do so, as this will fix your issue, and help your battery life.
Click to expand...
Click to collapse
How do I calibrate it?

There's an app on the Market called BatteryCalibration, works well.
Sent from my ADR6400L using Tapatalk

nosympathy said:
Thought I had commented on this, whoops.
So have you calibrated your battery since flashing 1.6.2?
If not you need to do so, as this will fix your issue, and help your battery life.
Click to expand...
Click to collapse
It may help battery life, but it won't fix the issue

dbisch said:
How do I calibrate it?
Click to expand...
Click to collapse
There are several threads explaining this but you just:
-Charge to 100% and boot into recovery
-Select advanced>wipe battery stats
-Use phone normally until battery dies and it powers off
-Charge back up to 100% (preferably while still off)
Edit- if you are running das bamf you can also clear them from the toolkit.

dirtyfingers said:
It may help battery life, but it won't fix the issue
Click to expand...
Click to collapse
It will fix the issue that the OP is having of the phone dropping % drastically when they reboot. If you are talking about the phone dropping from 100 to 95% or so after you unplug, then no it won't, because that is actually a safety feature that you do not want to fix, unless of course you want to burn your phone up.

ska.t73 said:
It will fix the issue that the OP is having of the phone dropping % drastically when they reboot. If you are talking about the phone dropping from 100 to 95% or so after you unplug, then no it won't, because that is actually a safety feature that you do not want to fix, unless of course you want to burn your phone up.
Click to expand...
Click to collapse
Thanks. I just want my battery % to be accurate.

dbisch said:
Thanks. I just want my battery % to be accurate.
Click to expand...
Click to collapse
No problem, if that is what you want then doing a battery stats wipe will do that. It should be done actually everytime you change ROMs or upgrade a ROM.
Just follow Dirtyfingers instructions, or use a Battery Calibration app from the market

ska.t73 said:
No problem, if that is what you want then doing a battery stats wipe will do that. It should be done actually everytime you change ROMs or upgrade a ROM.
Just follow Dirtyfingers instructions, or use a Battery Calibration app from the market
Click to expand...
Click to collapse
Man, don't say that in the dev area, or the irc. There was someone named Confucius on there yesterday reaming people for wiping battery stats. It wasn't pretty.
Doug B.

dvgb173 said:
Man, don't say that in the dev area, or the irc. There was someone named Confucius on there yesterday reaming people for wiping battery stats. It wasn't pretty.
Doug B.
Click to expand...
Click to collapse
It is a bad idea to wipe battery stats? Can it damage the phone?

dbisch said:
It is a bad idea to wipe battery stats? Can it damage the phone?
Click to expand...
Click to collapse
No your phone stores how long it takes to die charge etc. and when you change roms these stats obviously change and therefore wiping the stats allows the phone to really calibrate to the new rom. At least I think that's how it is.
Sent from my ThunderBolt using XDA App

dbisch said:
Example: my battery says 50%, I reboot, and now it's down to about 40%.
What's the deal? Anyone else have this problem?
I'm running Das BAMF 1.6.2, stock kernel.
Click to expand...
Click to collapse
This happens to me and it annoys me everytime it does it. I dont know why for some reason this is a recurring thing with HTC phones.

My battery drops 10-15% rather quickly when I unplug it but I believe this is actually normal with newer Li-Ion charging techniques.

Mine drops about 5% after a reboot. I reset my batteries stats today and hope that will improve my battery life, but I must say I got about 8 eight hours today with fairly heavy use and a few reboots.

After calibrating my battery...

for the past 3 days, this is what it does after just a random reboot. This was from this morning. *A huge drop in battery life*.
Now granted, have charged it a few times just until i can get to a moment where I can charge it fully without unplugging it.

Just for my own clarification, do you see the huge drop in battery power after the sudden reboot? If so, I'm wondering if the battery isn't bad, telling the phone it doesn't have a charge, and the phone shuts down/reboots.
Was anything done to the phone prior to this problem (new ROM, new kernel, rooted, etc.) other than calibrating the battery? What were you using to calibrate?

stephen_w said:
Just for my own clarification, do you see the huge drop in battery power after the sudden reboot? If so, I'm wondering if the battery isn't bad, telling the phone it doesn't have a charge, and the phone shuts down/reboots.
Was anything done to the phone prior to this problem (new ROM, new kernel, rooted, etc.) other than calibrating the battery? What were you using to calibrate?
Click to expand...
Click to collapse
My bad on the unclear post. Rushing, multitasking not working...lol. Yeah that's what i'm referring to. I edited the op.
Not sure why it does that. I'm using the battery calibrator from the market. I did install a new ROM a few days ago.
Sent from my SGH-T959V using xda premium

digitallure said:
My bad on the unclear post. Rushing, multitasking not working...lol. Yeah that's what i'm referring to. I edited the op.
Not sure why it does that. I'm using the battery calibrator from the market. I did install a new ROM a few days ago.
Sent from my SGH-T959V using xda premium
Click to expand...
Click to collapse
Lol, no worries, I was barely into my first cup of coffee. What ROM did you install? Any chance of using a different battery to see if it's the battery or possibly an issue with the phone ir the ROM?
Sent from my SGH-T959V using XDA App

stephen_w said:
Lol, no worries, I was barely into my first cup of coffee. What ROM did you install? Any chance of using a different battery to see if it's the battery or possibly an issue with the phone ir the ROM?
Sent from my SGH-T959V using XDA App
Click to expand...
Click to collapse
LOL. I flashed the Octane rom by raver. I don't have another battery to test it out, but It's happened a couple times with different roms. Usually when I calibrate, on a full charge at 4.2v, I wipe the stats about 2x's in cwm, then calibrate with the app, then unplug then plug again to boost it back to 4.2v then calibrate again. All of this just to make sure it's calibrated. may be overkill.

digitallure said:
LOL. I flashed the Octane rom by raver. I don't have another battery to test it out, but It's happened a couple times with different roms. Usually when I calibrate, on a full charge at 4.2v, I wipe the stats about 2x's in cwm, then calibrate with the app, then unplug then plug again to boost it back to 4.2v then calibrate again. All of this just to make sure it's calibrated. may be overkill.
Click to expand...
Click to collapse
I hear ya. I usually do that two or three times, too. All calibration does is, like you said, wipe the stats. The reboot is weird, though, as it's followed by that sudden drop in battery. Could be the battery is faulty. I wish I had more insight to help you.

stephen_w said:
I hear ya. I usually do that two or three times, too. All calibration does is, like you said, wipe the stats. The reboot is weird, though, as it's followed by that sudden drop in battery. Could be the battery is faulty. I wish I had more insight to help you.
Click to expand...
Click to collapse
No problem. That's the jist of it...lol

Heyy after calibrating the battery how long does it usually take to see the effects of extra battery life?

I've seen varying answers on that ranging from 1 day to a few days. A lot of calibrate after flashing a new ROM, so that might add a bit of time as the system rebuilds caches and whatnot. I would think that you would only need to do the full calibration once before starting to see the effects.
I usually do the calibration then go through letting it (almost) fully die, then do a full recharge 2 or 3 times.

stephen_w said:
I've seen varying answers on that ranging from 1 day to a few days. A lot of calibrate after flashing a new ROM, so that might add a bit of time as the system rebuilds caches and whatnot. I would think that you would only need to do the full calibration once before starting to see the effects.
I usually do the calibration then go through letting it (almost) fully die, then do a full recharge 2 or 3 times.
Click to expand...
Click to collapse
Thank you very much sir. So I should just put brightness to max, connect wifi, and turn on as many apps as i can before it almost dies, then turn back to normal and charge to 100?

xxjhnxx said:
Thank you very much sir. So I should just put brightness to max, connect wifi, and turn on as many apps as i can before it almost dies, then turn back to normal and charge to 100?
Click to expand...
Click to collapse
I don't do anything different when I let it die. I just let it happen through normal use. I guess if you wanted to accelerate it, that would work.

I'm not an expert in battery, but it looks to me like you're putting alot of stress on your battery from the constant wiping, calibrating, and letting it die. I'm not sure but i heard that letting it die too often is a bad thing. Have you tried calibrating it and just use it like normal?

Well err. I just calibrated my battery but it's still going down quickly. I lose like 5% battery in less than 10 minutes
Sent from my SGH-T959V using xda premium

[Q] Strange battery issue

Note: I searched the forum and saw nothing like my issue, if there is then I missed it and I apologize.
So here is the issue. When charging it gets to between 85-90% then immediately jumps to 100%. Have tried clearing the stats, draining, then full charge. Any suggestions on this?

How old is the battery are you charging USB or AC?
Most likely its a old battery
Sent from my Inspire 4G using xda premium

virusmonk3y said:
Note: I searched the forum and saw nothing like my issue, if there is then I missed it and I apologize.
So here is the issue. When charging it gets to between 85-90% then immediately jumps to 100%. Have tried clearing the stats, draining, then full charge. Any suggestions on this?
Click to expand...
Click to collapse
very odd, I've actually experienced the inverse. Charge would hold at like 20% and then jump to 10% in a second. Are you noticing in use there is a jump back down i.e. when you unplug, does it jump from 100% straight to 90% or does this just happen when charging. If it just happens with charging, I'd say run current widget and see how much mA is left when it makes the jump to 100% and see if the battery is actually charging correctly. In other words, if you're charging and the battery jumps from 90 to 100 and you still have like 200 mA left, something is goofy with your battery and I'd recommend a new battery or at the very least full wiping and reflashing your ROM.
If it jumps and the remaining mA is like 30 or something low, then the actual battery seems to be fine and I'd recommend a full wipe and reflash the rom you're using. In all honestly, it's probably the battery and may just be worth getting a new one.

virusmonk3y said:
Note: I searched the forum and saw nothing like my issue, if there is then I missed it and I apologize.
So here is the issue. When charging it gets to between 85-90% then immediately jumps to 100%. Have tried clearing the stats, draining, then full charge. Any suggestions on this?
Click to expand...
Click to collapse
Im not attacking you im just trying to clarify. Are you saying it jumps to 100%, meaning you see it say 100% or are you referring to the led going green at about 90%?

I'm not convinced it is a battery issue... I've only very recently rooted my phone (have had it for 11 months) and haven't had the charge indicator jump past the last 10% like it did just today.
Looking at the last 26hours of history (ICS 3.0.0 install), the initial battery discharge showed normal taper from 100-85%, however on charge it jumped from somewhere just below 90% to 100% instantaneously.
I should have taken a screenshot, but instead I wiped the battery stats and am in the initial discharge cycle still. I've had the phone 11 months and have never cleared the battery stats before.

Maybe 8 months old.
Sent from the internets

Darunion said:
Im not attacking you im just trying to clarify. Are you saying it jumps to 100%, meaning you see it say 100% or are you referring to the led going green at about 90%?
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Click to collapse
When it hits 85-90% the led turns green then it shows 100% right after that.
Sent from the internets

virusmonk3y said:
When it hits 85-90% the led turns green then it shows 100% right after that.
Sent from the internets
Click to expand...
Click to collapse
the led is supposed to go green at 90% to indicate trickle charge mode. but ya that should not be triggering the 100%. are you using a battery mod that isnt included with the rom?

virusmonk3y said:
When it hits 85-90% the led turns green then it shows 100% right after that.
Sent from the internets
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Click to collapse
Run the battery down until the phone dies. I have had this happen to me before. When I got down to 1%, it took a really long time for the phone to die. Recharging and doing a couple of long cycles of letting the battery go down to a really low level before charging fixed it. Do not delete battery stats as it does no good.
Sent from my Inspire 4G using Tapatalk

fernandezhjr said:
Run the battery down until the phone dies. I have had this happen to me before. When I got down to 1%, it took a really long time for the phone to die. Recharging and doing a couple of long cycles of letting the battery go down to a really low level before charging fixed it. Do not delete battery stats as it does no good.
Sent from my Inspire 4G using Tapatalk
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Click to collapse
Did that already, stated that in OP
Sent from the internets

Darunion said:
the led is supposed to go green at 90% to indicate trickle charge mode. but ya that should not be triggering the 100%. are you using a battery mod that isnt included with the rom?
Click to expand...
Click to collapse
No mod on the battery.
Sent from the internets

virusmonk3y said:
Did that already, stated that in OP
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Click to collapse
You stated in the op you cleared battery stats. I specifically mentioned trying the process without clearing battery stats and doing some additional cycles without clearing.
Sent from my Inspire 4G using Tapatalk

fernandezhjr said:
You stated in the op you cleared battery stats. I specifically mentioned trying the process without clearing battery stats and doing some additional cycles without clearing.
Sent from my Inspire 4G using Tapatalk
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Click to collapse
Indeed. I did that twice actually
Sent from the internets

virusmonk3y said:
Indeed. I did that twice actually
Sent from the internets
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Click to collapse
Well if calibration processes fail to correct it, then I would suspect a bad battery.
Sent from my Inspire 4G using Tapatalk

You might try an app called Battery Calibration. Found here http://forum.xda-developers.com/showthread.php?t=1024867
I don't necessarily use it to calibrate but to monitor the mV. It might help in seeing if it is in fact a bad battery or if your battery indicator is showing a false reading.
Sent from my MB860 using Tapatalk

jp2132 said:
You might try an app called Battery Calibration. Found here http://forum.xda-developers.com/showthread.php?t=1024867
I don't necessarily use it to calibrate but to monitor the mV. It might help in seeing if it is in fact a bad battery or if your battery indicator is showing a false reading.
Sent from my MB860 using Tapatalk
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Click to collapse
Yea I tried that after the normal calibration. Another weird thing is my phone has been sitting at 1% for like an hour.
Sent from the internets

virusmonk3y said:
Yea I tried that after the normal calibration. Another weird thing is my phone has been sitting at 1% for like an hour.
Sent from the internets
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Click to collapse
Go back and read my first post. I told you this would happen.
Sent from my Inspire 4G using Tapatalk

fernandezhjr said:
Go back and read my first post. I told you this would happen.
Sent from my Inspire 4G using Tapatalk
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Click to collapse
The sitting at 1% was happening before. Just never really payed attention to it. Have tried the normal calibration twice now and the method you mentioned as well. Going to ATT tomorrow and see about exchanging the battery. Will post results.
Edit: Want to add a thanks for all the suggestions from everyone.
Sent from the internets

virusmonk3y said:
The sitting at 1% was happening before. Just never really payed attention to it. Have tried the normal calibration twice now and the method you mentioned as well. Going to ATT tomorrow and see about exchanging the battery. Will post results.
Edit: Want to add a thanks for all the suggestions from everyone.
Sent from the internets
Click to expand...
Click to collapse
Then it may be that time. I got my battery to hold out a little longer, but soon after, I started getting bad drain. I recently replaced my battery and haven't had issues since.
Sent from my Inspire 4G using Tapatalk

virusmonk3y said:
The sitting at 1% was happening before. Just never really payed attention to it. Have tried the normal calibration twice now and the method you mentioned as well. Going to ATT tomorrow and see about exchanging the battery. Will post results.
Edit: Want to add a thanks for all the suggestions from everyone.
Sent from the internets
Click to expand...
Click to collapse
Sounds more like a battery calibration issue than a battery issue.
Give it a bit of thought... from 90% it skips to 100% when charging. However at 1% it camps out for an hour or more before shutting off. This indicates an issue with how the charge of the battery is being measured/expressed...
Now let's think about what is happening behind the scenes. This measure of charge is "defined as the available capacity expressed as a percentage of some reference, sometimes its rated capacity but more likely its current (i.e. at the latest charge-discharge cycle) capacity but this ambiguity can lead to confusion and errors. It is not usually an absolute measure in Coulombs, kWh or Ah of the energy left in the battery which would be less confusing. "
Essentially, the way the phone is measuring the battery isn't working correctly. However, is the duration of the battery life what you would expect given your use of it?
If YES, then it's a measuring issue.

Boot-Loop

I'm running on CyanogenMod 10.1 , and out of nowhere, after using the phone for around 10 minutes, it loses all the signal, shuts down and starts boot looping for no reason at all, is there any way to fix this?
The only way i can get the phone to turn on is by removing the battery and letting it sit over night, or by placing it in the freezer for some minutes <.<

Maybe your battery died? How old is it? Is the problem only in this rom?
Sent from my HTC Sensation XE with Beats Audio using xda app-developers app

FreakyDR said:
Maybe your battery died? How old is it? Is the problem only in this rom?
Sent from my HTC Sensation XE with Beats Audio using xda app-developers app
Click to expand...
Click to collapse
I've had the problem with a previous ROM, it is roughly one year old, and how can i check if the battery is damaged? Also, in the last couple of days it happens for no reason, even when im not touching the phone, it loses the signal and goes into boot-loop

Tell me how long your battery charge from about 10% to full?
10% to 80% charge faster than 80% to 100%?
When your battery full charge. Shutdown and remove it. Install battery again turn on. Will it drop power about 5 to 10%?
Sr about my English. I'm from Vietnam
Sent from my SHV-E160L using Tapatalk 2

Huongnv said:
Tell me how long your battery charge from about 10% to full?
10% to 80% charge faster than 80% to 100%?
When your battery full charge. Shutdown and remove it. Install battery again turn on. Will it drop power about 5 to 10%?
Sr about my English. I'm from Vietnam
Sent from my SHV-E160L using Tapatalk 2
Click to expand...
Click to collapse
No, the battery doesn't drop back down to 10%, and it sometimes take like an hour? maybe less from 10-20% to full charge

bump

mazune said:
No, the battery doesn't drop back down to 10%, and it sometimes take like an hour? maybe less from 10-20% to full charge
Click to expand...
Click to collapse
An hour to charge from 80% to 100%?
I think the problem is your battery

Huongnv said:
An hour to charge from 80% to 100%?
I think the problem is your battery
Click to expand...
Click to collapse
+1
No battery can charge within an hour
My phone needs at least 3-4 hours
Sent from my Sensational Device using Tapatalk 4 Beta
Want a cool place to hang out
Check this OUT!!!

mazune said:
I'm running on CyanogenMod 10.1 , and out of nowhere, after using the phone for around 10 minutes, it loses all the signal, shuts down and starts boot looping for no reason at all, is there any way to fix this?
The only way i can get the phone to turn on is by removing the battery and letting it sit over night, or by placing it in the freezer for some minutes <.<
Click to expand...
Click to collapse
i agree, its probably your battery. buy an anker one much better than stock. but i do feel the need to mention that putting your mobile phone in the freezer for any length is very very very dangerous and can leave your device very FUBAR

Ordering an Anker battery right now! thanks everyone

Huongnv said:
An hour to charge from 80% to 100%?
I think the problem is your battery
Click to expand...
Click to collapse
hanisod said:
+1
No battery can charge within an hour
My phone needs at least 3-4 hours
Sent from my Sensational Device using Tapatalk 4 Beta
Want a cool place to hang out
Check this OUT!!!
Click to expand...
Click to collapse
no guys
it is a htc common issue after rooting the device
no one has found a solution yet
also if you reboot the device while charging it it will jump to a higher percentage of charge
edit:but mazune in your situation i think you have a problem with your battery(shuts down,booloops,loosing signal etc...)

mazune said:
Ordering an Anker battery right now! thanks everyone
Click to expand...
Click to collapse
How much is it?
I cannot find it in Vietnam

Huongnv said:
How much is it?
I cannot find it in Vietnam
Click to expand...
Click to collapse
look at ebay

Huongnv said:
How much is it?
I cannot find it in Vietnam
Click to expand...
Click to collapse
Anker battery cost me about 18 $ very cheap from amazon

Finally got the new battery and I still have the same problem, any idea how to fix it, maybe a new rom and wiping everything?

mazune said:
Finally got the new battery and I still have the same problem, any idea how to fix it, maybe a new rom and wiping everything?
Click to expand...
Click to collapse
give a try with different roms and kernels to see
if the issue persists probably it is a hardware problem

Any rom you would recommend? Also, which way is the most efficient to delete the rom etc without leaving anything, I read that my problems could also be caused by a bad recovery/rom install

mazune said:
Any rom you would recommend? Also, which way is the most efficient to delete the rom etc without leaving anything, I read that my problems could also be caused by a bad recovery/rom install
Click to expand...
Click to collapse
begin with arhd rom from mike's thread
it is the closest to the stock
before flashing the rom do:
nandroid backup from recovery just in case
full wipe from recovery
flash the rom

rzr86 said:
begin with arhd rom from mike's thread
it is the closest to the stock
before flashing the rom do:
nandroid backup from recovery just in case
full wipe from recovery
flash the rom
Click to expand...
Click to collapse
Did everything you said, I still get infinite boot loops sadly :/

mazune said:
Did everything you said, I still get infinite boot loops sadly :/
Click to expand...
Click to collapse
post the bootloader details(i don't think i will find something there wrong there but just say)

battery not showing correct capacity

So this is my issue, the battery percentage seems to fluctuate badly, there will be one instance where it will charge till 75% and then stop charging and it will say like 1 minute till full charge then never go beyond 75%.
Another instance is the battery will go down really quickly to 1% then it will operate on 1% for like upto 2 hours and then shut down finally.
Things I've done so far.
Changed rom clean flash, wiped caches, flashed stock in odin.
The only thing now is my bootloader is from an older firmware than the rom firmware currently installed which is cas rom.
Any insight or help would be great full. Thank you

Bump, does this sound like a hardware battery issue?

sofir786 said:
Bump, does this sound like a hardware battery issue?
Click to expand...
Click to collapse
Try a new cable?
Sent from my SM-G920W8 using Tapatalk

DarryDoo said:
Try a new cable?
Click to expand...
Click to collapse
I'll see if I can find another but this cable charges other devices fine

I have problems too with battery capacity especially at last 15% before i wasn't have this problem

It's very annoying because I never know how much battery I actually have left, I have to always have my portable charger with me just in case

sofir786 said:
It's very annoying because I never know how much battery I actually have left, I have to always have my portable charger with me just in case
Click to expand...
Click to collapse
I would simply first try another cable and also wall adaper. If this doesnt change anything, make a backup and go FULL stock. Not just flashing some oartitions, but your last stock ROM completely. If this doesn't make a change, then it probably is your battery, that is faulty. Try to have Samsung exchange it then. I just hope that we won't have similar problems, as the Note and S7 ppl.
Sent from my SM-G925F using XDA Free mobile app