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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.

[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%?
Click to expand...
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
Click to expand...
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
Click to expand...
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
Sent from the internets
Click to expand...
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
Click to expand...
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
Click to expand...
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
Click to expand...
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
Click to expand...
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
Click to expand...
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.

it died on me for no apparent reason...

nearly was late for work because my phone died and i was using it as an alarm. what could have drained 50% battery in 6 hours and not show? wifi was off

while the graph is nice, better battery stats is what we need.

ihatelolcats said:
nearly was late for work because my phone died and i was using it as an alarm. what could have drained 50% battery in 6 hours and not show? wifi was off
Click to expand...
Click to collapse
Poor mobile network signal

aavvaallooss said:
Poor mobile network signal
Click to expand...
Click to collapse
Except it's green meaning full signal all the way to death...

ihatelolcats said:
Except it's green meaning full signal all the way to death...
Click to expand...
Click to collapse
what you didnt post is the page with what was using your battery by %. now how are we supposed to tell you what happened and what used your battery? this thread is pointless because you gave us no usable information. what i got from the info that you did post is that a UFO flew by you and drained your battery of its power. and the thing is, my guess will be just as good as any other guess.

simms22 said:
what you didnt post is the page with what was using your battery by %. now how are we supposed to tell you what happened and what used your battery? this thread is pointless because you gave us no usable information. what i got from the info that you did post is that a UFO flew by you and drained your battery of its power. and the thing is, my guess will be just as good as any other guess.
Click to expand...
Click to collapse
sorry but there was nothing out of the ordinary there so i didnt even think to screenshot it. by a large margin the screen used the most % battery. i thought it might have stuck on but that's not shown in the above shot

ihatelolcats said:
sorry but there was nothing out of the ordinary there so i didnt even think to screenshot it. by a large margin the screen used the most % battery. i thought it might have stuck on but that's not shown in the above shot
Click to expand...
Click to collapse
right, not in the posted shot. could have been an app that decided not to go away and drain your battery instead.

simms22 said:
right, not in the posted shot. could have been an app that decided not to go away and drain your battery instead.
Click to expand...
Click to collapse
+1 to this theory
Sent from my Nexus 5

is that a known problem with the alarm app itself? stock rom
there just wasn't anything that stood out to me on the app battery use list

ihatelolcats said:
is that a known problem with the alarm app itself? stock rom
there just wasn't anything that stood out to me on the app battery use list
Click to expand...
Click to collapse
stock alarm app, no. but you do have a lot of wakelocks. when the screen is shown off, your device should be asleep. your device shows a lot of activity when your screens off(ironically, not when the supposed battery drain happened though, so i cant say thats why it drained).

Do you have the horrid camera bug?

Do you use exchange at all? I've had a lot of phones (android mostly htc and iphones) hit bugs from exchange in push mode and burn through their battery really quickly constantly trying to sync and hitting an error.
I charge mine on my dresser next to my head, and also use it as an alarm, I'd recommend charging it over night

Stealyourface said:
Do you have the horrid camera bug?
Click to expand...
Click to collapse
god i hope not. what is that?
i don't use exchange

davidcampbell said:
Do you use exchange at all? I've had a lot of phones (android mostly htc and iphones) hit bugs from exchange in push mode and burn through their battery really quickly constantly trying to sync and hitting an error.
I charge mine on my dresser next to my head, and also use it as an alarm, I'd recommend charging it over night
Click to expand...
Click to collapse
i charge it every night, and its also by me every night, as its also my only alarm.

ihatelolcats said:
god i hope not. what is that?
i don't use exchange
Click to expand...
Click to collapse
I'm guessing this http://www.androidcentral.com/googl...cpu-usage-bug-fix-coming-next-android-release
I found it by googling "Nexus 5 horrid camera bug" lol, first link

Stock apps have no such issue as till date.Except for apps that use internet /wifi consume a lot of battery. So switch of those frst or keep ur cell on flight mode. The battery consumption may be due to gplay service, account sync,gmaps etc. I don't own a nexus device but I have experienced this kind of behaviour with my phone sometimes with a hot back cover sometimes.Try using apps like greenify to control this prob(or switch of ur network @ night/use lower cpu values + governers like powersave/conservative)

[Q] What is this thing that is eating my battery? com.android.systemui

Rooted -- Calkulin's Stock "Battery Saver" ROM -- Xposed Framework -- a few mods from XBlast Tools running.
First off, a Root Explorer search for com.android.systemui returned nothing.
What is com.android.systemui? I don't think I saw this in my usage until a couple of days ago.
Why does 31 seconds of CPU and 1 second of keep awake = almost TRIPLE the battery use of 12 minutes of screen-on time?????

moseso said:
Rooted -- Calkulin's Stock "Battery Saver" ROM -- Xposed Framework -- a few mods from XBlast Tools running.
First off, a Root Explorer search for com.android.systemui returned nothing.
What is com.android.systemui? I don't think I saw this in my usage until a couple of days ago.
Why does 31 seconds of CPU and 1 second of keep awake = almost TRIPLE the battery use of 12 minutes of screen-on time?????
Click to expand...
Click to collapse
It's the actual System User Interface. So most likely a combination of the rom and xposed are causing this. Also, dirty flashes of ROMs can cause this.
If you installed a new xposed module and noticed a battery drain the uninstall that module. Otherwise remove other xposed modules. You could always try a frew full wipe in recovery as well.
I have had this issue with mostly with dirty flashing which is my queue to do a clean flash. It's also possible if you restored any apps with data, like from Titanium Backup, could potentially cause this as well.

moseso said:
Rooted -- Calkulin's Stock "Battery Saver" ROM
Click to expand...
Click to collapse
you got caught up in a lie, with buzzwords that are pushing for you to use the rom. theres no such thing as a battery saving rom. all those scripts/mods being used in the rom are just buzzwords. battery life is all dependent on how you personally use your device, how you set up your device, and your data/phone signal quality. a rom will not save you battery.

Thanks for the help, Tom. A visit to recovery to wipe caches and fix permissions and a reboot caused this -->
simms -- I do understand that. I am not really disappointed in my battery life -- and it doesn't seem to have changed much in the week that I've had the phone. But the reporting of it had, and that sort of alarmed me...

moseso said:
Thanks for the help, Tom. A visit to recovery to wipe caches and fix permissions and a reboot caused this -->
simms -- I do understand that. I am not really disappointed in my battery life -- and it doesn't seem to have changed much in the week that I've had the phone. But the reporting of it had, and that sort of alarmed me...
Click to expand...
Click to collapse
wow, your android system is high, even though only 10% battery was used. a reboot might fix that though. you might have to go through your settings and setup again, disable stuff like google location reporting/history(it wont disable your location).

simms22 said:
wow, your android system is high, even though only 10% battery was used. a reboot might fix that though. you might have to go through your settings and setup again, disable stuff like google location reporting/history(it wont disable your location).
Click to expand...
Click to collapse
I'm beginning to think the issue I'm having is in the reporting -- not actually a battery use problem. I've only had the phone a week, so my data base is small, but I haven't really seen bad battery life nor any real change in it. Even with some use and a bunch of time fiddling with the mods and stuff, I've yet to go to bed with less than 50% left. Mostly, more...
Here's the latest pics. com.android.systemui is back on top in the overview with 36% The detail page shows 39% and a whole 2 seconds of CPU. That just CAN'T be right...

moseso said:
I'm beginning to think the issue I'm having is in the reporting -- not actually a battery use problem. I've only had the phone a week, so my data base is small, but I haven't really seen bad battery life nor any real change in it. Even with some use and a bunch of time fiddling with the mods and stuff, I've yet to go to bed with less than 50% left. Mostly, more...
Here's the latest pics. com.android.systemui is back on top in the overview with 36% The detail page shows 39% and a whole 2 seconds of CPU. That just CAN'T be right...
Click to expand...
Click to collapse
Can u show the battery graph? And also why is your bluetooth on every time.

varuntis1993 said:
Can u show the battery graph? And also why is your bluetooth on every time.
Click to expand...
Click to collapse
Which battery graph? You mean the current usage graph I showed in the OP, from Battery Monitor Widget?
Re Bluetooth: I just leave it on, so when I step in the car it just connects to the car. No muss, no fuss, no bother.
I suppose I could try turning it off and see how much battery I save. I know with my previous phone (EVO4G) the point at which I started leaving the bluetooth on all the time didn't change my battery life to any noticeable extent.
Here's battery monitor widget current use. The EVO idled at 70 - 95 ma. This one does seem to draw a lot more at idle. I don't know what's "normal."

moseso said:
Which battery graph? You mean the current usage graph I showed in the OP, from Battery Monitor Widget?
Re Bluetooth: I just leave it on, so when I step in the car it just connects to the car. No muss, no fuss, no bother.
I suppose I could try turning it off and see how much battery I save. I know with my previous phone (EVO4G) the point at which I started leaving the bluetooth on all the time didn't change my battery life to any noticeable extent.
Here's battery monitor widget current use. The EVO idled at 70 - 95 ma. This one does seem to draw a lot more at idle. I don't know what's "normal."
Click to expand...
Click to collapse
Stock battery app like this

varuntis1993 said:
Stock battery app like this
Click to expand...
Click to collapse
Not very interesting. It keeps resetting, every time I plug in to USB to transfer the screenshots to my mac for posting here. I'm not leaving it plugged in very long -- I just move the pics and unplug it. I unplugged it this morning at 7:30 AM. It's now almost seven hours later and I'm at 93%. That ain't bad. It's a gradual descent -- no big drops like the one in your post.

moseso said:
Not very interesting. It keeps resetting, every time I plug in to USB to transfer the screenshots to my mac for posting here. I'm not leaving it plugged in very long -- I just move the pics and unplug it. I unplugged it this morning at 7:30 AM. It's now almost seven hours later and I'm at 93%. That ain't bad. It's a gradual descent -- no big drops like the one in your post.
Click to expand...
Click to collapse
Mine stats those are from my nexus 7 2013, Sot of around 4 and still 55% battery left.
I just showed u for sample. A simple restart should fix as simms told
I m on stock rom with x blast tool never happened with me....u can try to use ur phone in safe mode and see...I know its a system app but u can give a try with bluetooth off. Or flash a diff rom and see

If your phone is vibrating a lot and you have extra UI elements installed this seems normal.
When you only use a small percentage of the full battery smaller drains appear large.
Bit off topic, but have you thought of using WiFi to move your files over? No messing with the wire and you could even automate the task.
Sent from my Nexus 5 using Tapatalk

bblzd said:
Bit off topic, but have you thought of using WiFi to move your files over? No messing with the wire and you could even automate the task.
Sent from my Nexus 5 using Tapatalk
Click to expand...
Click to collapse
Thanks for the push. Found a nifty WiFi file transfer app this morning. Boy, is that slick!

[Q] help? Batterry precentage

Hi Guys, i'm noob, i wana ask about my htc sensation, after 2 year i'm using it, today i found
when battery charging (htc Senstaion) dismiss displaying percentage of battery after i restarting while charging.
****battery charging ------> Battery percentage displaying 60% then i restarting the phone while this situation
and then when phone finish restarting and ready to use battery precentage displaying 100%(full)
is it normal?
sorry my english bad

Boot into recovery and wipe battery stats.
Sent from my HTCSensation using XDA Premium 4 mobile app

if not all many users(including me) have this situation
it is a htc's common issue after rooting the device
there is no a solution yet
it is just a percentage misreading
by the way i don't know if wipe battery stats will help

rzr86 said:
if not all many users(including me) have this situation
it is a htc's common issue after rooting the device
there is no a solution yet
it is just a percentage misreading
by the way i don't know if wipe battery stats will help
Click to expand...
Click to collapse
After rooting??? R u sure about that ??
I was suffering same issue before rooting and after rooting..
Wipe battery status is useless here ..
Its HTC's fault....

Itsakash said:
After rooting??? R u sure about that ??
I was suffering same issue before rooting and after rooting..
Wipe battery status is useless here ..
Its HTC's fault....
Click to expand...
Click to collapse
before rooting?
for me that never happened
also wipe battery stats is useless and indeed it is htc's fault

rzr86 said:
if not all many users(including me) have this situation
it is a htc's common issue after rooting the device
there is no a solution yet
it is just a percentage misreading
by the way i don't know if wipe battery stats will help
Click to expand...
Click to collapse
Just a percentage misreading? But if the phone thinks it's at 100% won't it stop charging then?

emrvb said:
Just a percentage misreading? But if the phone thinks it's at 100% won't it stop charging then?
Click to expand...
Click to collapse
probably it stops
i am not sure about that
edit: the point is the battery is increasing its percentage slower when it passes 60%-70%
but it charges the same
so if you reboot the device then it jumps at 90% or full charge

rzr86 said:
probably it stops
i am not sure about that
edit: the point is the battery is increasing its percentage slower when it passes 60%-70%
but it charges the same
so if you reboot the device then it jumps at 90% or full charge
Click to expand...
Click to collapse
Is it known what causes this?
Someone above said "it is a htc's common issue after rooting". Is there any source on that? For all I know, percentage of charge of battery is determined by a combination of output voltage and amps, preferably referenced by a table taking battery age into account (correct me if I'm wrong though).
Rooting the device should not be an issue, unless HTC did something in their rom to detect this and let the battery percentage be wrong. Then again, most of us aren't on the stock rom. To be on another rom, the bootloader needs to be unlocked. Did HTC do something that unlocking the bootloader makes voltage/discharge readings unreliable? I doubt that...
I'm interested in this because I unlocked and flashed a Sensation XE for a friend of mine (SultanXDA's KitKat rom), but the battery discharges very, very fast, without an obvious cause. So I wonder whether it could be the battery is not fully charged and/or the phone decides it's empty to early.

"it is a htc's common issue after rooting"<- i said that
it was a source but i can't find it now
also i don't know if htc did something with unlocking the bootloader by purpose
if you flashed the rom recently don't judge the battery too early
give it 4-5 cyrcle charges until it settles down then see how it goes

emrvb said:
I unlocked and flashed a Sensation XE for a friend of mine (SultanXDA's KitKat rom), but the battery discharges very, very fast, without an obvious cause. So I wonder whether it could be the battery is not fully charged and/or the phone decides it's empty to early.
Click to expand...
Click to collapse
I have exactly this problem.
It sounds like the same ROM, Saltan kit kat. I am using the latest kernal 3.4, having tried two kernals I get the same results. For example I charged the phone to full, and after 2 hours of use I'm down to 55%, WiFi on and browsing, gmail synced but not much else, screen brightness turned down etc.
I only flashed a couple days ago, will it improve massively over the next few days?
The phone was giving a days charge easily before flashing.
I am also noticing a message saying 'unfortunately process com.android.phone has stopped working' (or similar). When this happens and I click OK I notice the signal disappears for a few seconds before coming back. Could this be the cause of the problem?
Could it be he ROM?
I'm new to all this but managed to unlock, root, flash recovery, and flash the ROM thanks to the brilliant guides on XDA. Any help with the above would be appreciated.
Rob

i am facing the same problem , rather my problem is goes much further .
iam on stock ROM and not rooted my sensation. my device often restart automatically even when battery is about 90% or battery is 40% and it continue this from last 2-3 months.
and after restarting battery percentage is also changed, see attached pics.
i am tired of this rebooting , i observed that restaring is mostly when i connect to calls or text msgs.
can somebody pleeeeeeaase help me.

tAheEr73 said:
i am facing the same problem , rather my problem is goes much further .
iam on stock ROM and not rooted my sensation. my device often restart automatically even when battery is about 90% or battery is 40% and it continue this from last 2-3 months.
and after restarting battery percentage is also changed, see attached pics.
i am tired of this rebooting , i observed that restaring is mostly when i connect to calls or text msgs.
can somebody pleeeeeeaase help me.
Click to expand...
Click to collapse
since you are completely stock then the only thing i can tell you is to check your battery if it fits correctly
also how old is it?

rzr86 said:
since you are completely stock then the only thing i can tell you is to check your battery if it fits correctly
also how old is it?
Click to expand...
Click to collapse
thanks for ur reply ,
i have inserted plastic card behind battery for proper contact (adviced by many people at xda) but problem is not solved. my battary is 6 month old.
may be it is battery as i purchased from local market.
i have ordered new battery and soon will recive that . will let you know.
i have observed that mostly mobile got restart when i make/recieve calls and sms.

Spawn-uk- said:
I have exactly this problem.
It sounds like the same ROM, Saltan kit kat. I am using the latest kernal 3.4, having tried two kernals I get the same results. For example I charged the phone to full, and after 2 hours of use I'm down to 55%, WiFi on and browsing, gmail synced but not much else, screen brightness turned down etc.
I only flashed a couple days ago, will it improve massively over the next few days?
The phone was giving a days charge easily before flashing.
I am also noticing a message saying 'unfortunately process com.android.phone has stopped working' (or similar). When this happens and I click OK I notice the signal disappears for a few seconds before coming back. Could this be the cause of the problem?
Could it be he ROM?
I'm new to all this but managed to unlock, root, flash recovery, and flash the ROM thanks to the brilliant guides on XDA. Any help with the above would be appreciated.
Rob
Click to expand...
Click to collapse
Does anyone have any ideas? Today the phone lasted around 12 hours but with minimal use which isn't really good enough. I thought rooting and flashing would improve battery life but so far I am disappointed. I may try another ROM tomorrow.
Rob

i'm try to buying new original batery but still same problem,
now i'm trying viver rom sc.5.1, with last Sebastian FM kernel
this rom verry awesome i'd like this but baterry percentage still problem:
----------------------------------------------------------------------------------------------------------------------------------------------------------
DEVICE: HTC Sensation Z710e
PREVIOUS ROM:Rooted Stock Rom ICS Sence 3.6
CURRENT ROM:ViperS 5.1.0 JB Sense 5
FIRMWARE:3.32.401.5
PREVIOUS KERNEL: htc kernel
CURRENT KERNEL:kernel 3.4.10 by SebastianFM
BOOTLOADER:unlocked
HBOOT VERSION:1.27.0000
RECOVERY:4EXT recovery touch v.1.0.0.6 RC1
S-ON
Thanks
for all REPLY

tAheEr73 said:
thanks for ur reply ,
i have inserted plastic card behind battery for proper contact (adviced by many people at xda) but problem is not solved. my battary is 6 month old.
may be it is battery as i purchased from local market.
i have ordered new battery and soon will recive that . will let you know.
i have observed that mostly mobile got restart when i make/recieve calls and sms.
Click to expand...
Click to collapse
This really sounds like your battery, especially if it's not the original or equivalent. But, it could also be an app on the background, keeping your phone from "deep sleep". Bad cell coverage (very low signal) also drains your battery relatively quickly when you're on 3G. A good WiFi connection consumes less power than 3G with bad signal. Another possibility could be (but unlikely) is that your phone is intended for another region and thus having trouble communicating with the GSM network.
- Check your battery.
- Check what your battery is used for.
- Check your battery time with network set to GSM only.
---------- Post added at 10:21 PM ---------- Previous post was at 10:04 PM ----------
rzr86 said:
"it is a htc's common issue after rooting"<- i said that
it was a source but i can't find it now
also i don't know if htc did something with unlocking the bootloader by purpose
if you flashed the rom recently don't judge the battery too early
give it 4-5 cyrcle charges until it settles down then see how it goes
Click to expand...
Click to collapse
Still you keep saying "after rooting" which is significantly different from unlocking the bootloader and flashing. Furthermore, to me it seems far more people report "better battery life" with their new roms.
About initially flashing the rom: i thought format of system, data and cache (including dalvik cache) ought to be enough. It has had somewhere between the 10 and 20 charge cycles by now. Battery life improved a little, but it's still far from acceptable. The battery percentage between reboots should only differ marginally between reboots (might need a few minutes of usage to become accurate). Also notable: over 20% difference in percentage reading between rom and recovery.
I wouldn't mind investigating this. So I wonder if anyone with "proper" battery life could provide me a "dumpsys" for the battery service and would perhaps have the time to take a look at /proc with me.

emrvb said:
Still you keep saying "after rooting" which is significantly different from unlocking the bootloader and flashing. Furthermore, to me it seems far more people report "better battery life" with their new roms.
About initially flashing the rom: i thought format of system, data and cache (including dalvik cache) ought to be enough. It has had somewhere between the 10 and 20 charge cycles by now. Battery life improved a little, but it's still far from acceptable. The battery percentage between reboots should only differ marginally between reboots (might need a few minutes of usage to become accurate). Also notable: over 20% difference in percentage reading between rom and recovery.
I wouldn't mind investigating this. So I wonder if anyone with "proper" battery life could provide me a "dumpsys" for the battery service and would perhaps have the time to take a look at /proc with me.
Click to expand...
Click to collapse
i unlocked the bootloader and root the device at the same period and i stayed for months with the stock rom
i don't know which one is responsible for percentage misreadings
also don't get confused
i am talking only for percentage misreadings and not for better battery life
and only when you charge the device.not unplugged
of course i had(and i still have) very good battery life with whatever rom i have flashed
by the way i have noticed the percentage difference between recovery and rom but i don't remember if it was 20%

rzr86 said:
i unlocked the bootloader and root the device at the same period and i stayed for months with the stock rom
i don't know which one is responsible for percentage misreadings
also don't get confused
i am talking only for percentage misreadings and not for better battery life
and only when you charge the device.not unplugged
of course i had(and i still have) very good battery life with whatever rom i have flashed
by the way i have noticed the percentage difference between recovery and rom but i don't remember if it was 20%
Click to expand...
Click to collapse
Alright, thanks for clearing that up. I really want to solve this issue, so I'm quite keen on getting the facts straight.
Back to my issue then (yeah I'm effectively hijacking this thread): is it possible the percentage misreading is causing the battery not to fully charge and/or discharge? Or should I direct my search to another cause?
This is what I found (or did not find) so far:
- Stand-by time seems great, the drain occurs when the screen is on.
- There is nothing in the normal battery usage (usage goes to screen)
- I was unable to detect an obvious culprit with better battery stats.
- I did notice that when I do a dumpsys, service battery shows voltage in V, while my Sony shows it in mV.
- I tried offline charging for about an hour today (light still orange), after boot the battery indicator showed 100%. It dropped to 86% in 7 to 8 minutes.

emrvb said:
I tried offline charging for about an hour today (light still orange), after boot the battery indicator showed 100%. It dropped to 86% in 7 to 8 minutes.
Click to expand...
Click to collapse
probably never truly reached the full charge(100%) when charged it in that one hour
by the way how old is your battery?
did you try with a new one?

rzr86 said:
since you are completely stock then the only thing i can tell you is to check your battery if it fits correctly
also how old is it?
Click to expand...
Click to collapse
please see attached screenshots
what do u think , is this battery or some hardware etc fault??