[Q] Nexus 4 shows wrong battery stats - Nexus 4 Q&A, Help & Troubleshooting

Hi, I've bought a nexus 4 about a month ago. I works great and the battery life is good enought but i notice that sometimes I connect the charger (when the battery is 40% full for example) and a few minutes later it says it is 100%.
Ofcourse it's not and some minutes later it drops. If I reboot the phone it shows the correct percentaje, but I happens very often.
Somebody has the same issue?
I didn't try to wipe the battery stats because I didnt install a custom recovery. Is there any way to fix it without flashing it?
thanks

serialger said:
Hi, I've bought a nexus 4 about a month ago. I works great and the battery life is good enought but i notice that sometimes I connect the charger (when the battery is 40% full for example) and a few minutes later it says it is 100%.
Ofcourse it's not and some minutes later it drops. If I reboot the phone it shows the correct percentaje, but I happens very often.
Somebody has the same issue?
I didn't try to wipe the battery stats because I didnt install a custom recovery. Is there any way to fix it without flashing it?
thanks
Click to expand...
Click to collapse
Most N4's have some quirky battery stat behaviour. You'll have to learn to live with it, wiping battery stats, or reflashing the stock images, or an alternative ROM, won't do anything to address this.

CMNein said:
Most N4's have some quirky battery stat behaviour. You'll have to learn to live with it, wiping battery stats, or reflashing the stock images, or an alternative ROM, won't do anything to address this.
Click to expand...
Click to collapse
Really? SO ****ING AWESOME! haha
thanks!

serialger said:
Really? SO ****ING AWESOME! haha
thanks!
Click to expand...
Click to collapse
It's the first thing I noticed about the phone. I've only charged from 0 to 100 in a second once though when I first got the phone, aside from that just the occasional lazy updating of the actual percentage. Stressing the phone a bit tends to help it "catch up" to where it should be.
Edit: you know, it's good OCD therapy, it may help you get past your OCD if you have it.
If you don't have OCD, you certainly will now...

CMNein said:
It's the first thing I noticed about the phone. I've only charged from 0 to 100 in a second once though when I first got the phone, aside from that just the occasional lazy updating of the actual percentage. Stressing the phone a bit tends to help it "catch up" to where it should be.
Click to expand...
Click to collapse
Yes, the same happened to me, the issue is that sometimes I lost track of when it plug it to the charger and after use it the battery drains. It is very annoying.
I will try to charge from 0 to 100 a few times to si if the stats sync with the real battery state...
Thank

I'm getting pretty consistent reading far as 0% - 100% goes (course I drained the battery down to zero twice and charged back up).
What I'm finding that seems rather weird is glitchy mV reading with battery monitor widget pro. It does decrease as the battery decreases as expected, what's unexpected is all the lil spikes upward in it's value over time, like every few mins it'll jump up like from 3995mv to 4040mv or similar jumps as if the widget can't get an accurate reading of the battery's mV level. So it look weird because the only time you would see the mV rising, is if you're charging it.
And I know someone else on this forums with a Nexus 4 that's actually showing positive mA values when he's not even plugged into a charger.
But as far as % reading goes, seems pretty accurate now, just the readings I'm getting from battery monitor widget had me concerned that the battery was bad on my less than a week old Nexus 4. My Nexus 7's history/stats look rock-stable by comparison, kind of wondering if it's an LG thing.

kbeezie said:
I'm getting pretty consistent reading far as 0% - 100% goes (course I drained the battery down to zero twice and charged back up).
What I'm finding that seems rather weird is glitchy mV reading with battery monitor widget pro. It does decrease as the battery decreases as expected, what's unexpected is all the lil spikes upward in it's value over time, like every few mins it'll jump up like from 3995mv to 4040mv or similar jumps as if the widget can't get an accurate reading of the battery's mV level. So it look weird because the only time you would see the mV rising, is if you're charging it.
And I know someone else on this forums with a Nexus 4 that's actually showing positive mA values when he's not even plugged into a charger.
But as far as % reading goes, seems pretty accurate now, just the readings I'm getting from battery monitor widget had me concerned that the battery was bad on my less than a week old Nexus 4. My Nexus 7's history/stats look rock-stable by comparison, kind of wondering if it's an LG thing.
Click to expand...
Click to collapse
Well this is odd... i think it might be an issue with the -kind of- voltimeter (battery sensor? i dont know how to name it). The battery life is ok up to now but the stats are driving me crazy!

serialger said:
Well this is odd... i think it might be an issue with the -kind of- voltimeter (battery sensor? i dont know how to name it). The battery life is ok up to now but the stats are driving me crazy!
Click to expand...
Click to collapse
Those of us who look beyond just the % available are easily driven crazy.
But then again because I do, I was able to prove a certain brand of charger was incompatible with my Nexus tablet.
Sent from my Nexus 7 using XDA Premium HD app

I tried to catch it in the act via adb and shell last fall pinging the voltage, fuel gauge, etc... but that was all my n00b self was good for.
Sent from my Nexus 4 using Tapatalk 4 Beta

I've noticed that my battery % is off also. Not as bad as jumping up to 100% or anything, but I notice that when charging, the % is 20% higher than the actual battery. It'll say fully charged, but when I reboot the phone it'll say something like 83%. That happens a lot, and not always at '100%'. If I reboot anytime during the charging process, it drops around 20%. I haven't tried to do it right after I connect it, but every time I do actually reboot it happens. Kinda weird. Not even close to a deal-breaker or anything, just a quirk that I wouldn't mind getting fixed.

kbeezie said:
I'm getting pretty consistent reading far as 0% - 100% goes (course I drained the battery down to zero twice and charged back up).
What I'm finding that seems rather weird is glitchy mV reading with battery monitor widget pro. It does decrease as the battery decreases as expected, what's unexpected is all the lil spikes upward in it's value over time, like every few mins it'll jump up like from 3995mv to 4040mv or similar jumps as if the widget can't get an accurate reading of the battery's mV level. So it look weird because the only time you would see the mV rising, is if you're charging it.
And I know someone else on this forums with a Nexus 4 that's actually showing positive mA values when he's not even plugged into a charger.
But as far as % reading goes, seems pretty accurate now, just the readings I'm getting from battery monitor widget had me concerned that the battery was bad on my less than a week old Nexus 4. My Nexus 7's history/stats look rock-stable by comparison, kind of wondering if it's an LG thing.
Click to expand...
Click to collapse
My nexus is also showing +ve mA values while it's not charging, and the values are absolutely crazy, +268, +168, +1171
Is it a battery issue?
I have charged it completely (8 hours) many times and run it to the bottom , tried deleting battery stats etc but nothing has helped.
Shall I get the battery replaced?

tried to delete the battery stats file and wait for a while and see if any difference?
Sent from my Nexus 4 using XDA Premium 4 mobile app

floxrin said:
tried to delete the battery stats file and wait for a while and see if any difference?
Sent from my Nexus 4 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Tried that multiple times but no change, what are the possibilities? Damaged battery? Damaged battery sensors on the phone?

japmeet said:
Tried that multiple times but no change, what are the possibilities? Damaged battery? Damaged battery sensors on the phone?
Click to expand...
Click to collapse
How old is the phone?
http://pocketnow.com/android/deleting-androids-batterystatsbin-wont-grant-more-jiuce

Well Google support definitely knows this is a big problem. After I explained the exact same issues I was having with the battery indicator being wrong they offered a in warranty replacement right away with no trouble shooting what so ever. Problem was they wanted to authorize my debit card for the full price of a phone plus shipping until they received mine back. Unfortunately I didn't have 230 bucks that I could just have tied up in authorization limbo for 2 weeks. So they transferred me to LG support because they have a return policy where they let you ship the phone back first. LG at first tried to say they only do paid repairs on Nexus 4's and that google is responsible for warranty's, but a little arguing about manufacturer warranty laws in the US and threatening to file a complaint with the FCC they agreed to replace the phone under LG warranty. Again they didn't do any troubleshooting at all. Upon explaining the problem they went right into replacement phone. This leads me to believe there is no easy fix or software problem they can update, but rather a hardware problem.

Johmama said:
I've noticed that my battery % is off also. Not as bad as jumping up to 100% or anything, but I notice that when charging, the % is 20% higher than the actual battery. It'll say fully charged, but when I reboot the phone it'll say something like 83%. That happens a lot, and not always at '100%'. If I reboot anytime during the charging process, it drops around 20%. I haven't tried to do it right after I connect it, but every time I do actually reboot it happens. Kinda weird. Not even close to a deal-breaker or anything, just a quirk that I wouldn't mind getting fixed.
Click to expand...
Click to collapse
I have exactly this behavior all of a sudden the last 2 weeks.

I have worse issues....
We had the screen/digitizer replaced after my wife dropped the phone.
The phone now has some issues. It will charge, and operate ok until the battery reaches about 80%.
Then the touch will go crazy, and the phone will turn off.
Upon rebooting, the battery is suddenly at 0%.
I purchased a new battery and installed it. It charged to 100% the first time and the phone lasted for a while.
Then after that it refused to charge at all. Didn't matter how many times I did the power + volume up trick.
I put the original battery back in, and it charges, but of course dies after it reaches 80%.

Same here. Problems after screen replacement month or two ago, not sure that related. Battery went bad. After replacement with a new one (original not chinies) not stable: shows 100% charge then turn off on in 10 min, after powered on again shows 65 % and after 10 minutes plugged in 100% charged.
Driving me crazy... Fully wiped, factory reset all the same. Rooted and wiped battery stats not helped. Very frustrating if some one can suggest one else can be done...
The phone is just fine, powerfull . no reasons to replace

I also developed my battery issue about a month after replacing the screen and digitizer. I'm going to take it apart and clean the connectors and see if that helps, because I'm so annoyed I'm about to buy a new phone.

My guess is that the battery was damaged during the screen/digitizer replacing process. It happened to me recently. No biggie 24 € for a new LG original battery seems pretty cheap and the problem was solved. But why are nowdays batteries somewhat soft??
Sent from my Nexus 4 using XDA Free mobile app

Related

[Q] Battery defect or rom issue?

Hello!
Sorry I can't post this in the Paranoid Android thread yet. As a noob I can't post in that forum until I have 10 posts so I'm at a loss as to where I should post this.
Anyway, I just put the new 2.1799 PA ROM on my Nexus 7. Unfortunately, I seem to have a serious battery drain when the screen is on. I have read many posts where people claim to have easily achieved 6+ hours of active screen time per battery charge whereas I'm only getting 3-4 hours of active screen time per charge, almost all of it related to web surfing. I have a strong wifi signal and I keep my screen brightness around 20/30 range. I'm not sure if it's the ROM or if my battery is defective.
I have also read about a battery calibration app through a different thread. Is that necessary for the PA ROM? I didn't see anything in the tutorial mentioning a battery calibration.
Included are two pictures, although they aren't very indicative of my problem as my tablet was sitting in my backpack for most the day.
Please tell me I'm just being paranoid! Thank you for the help!
thatnoob said:
Hello!
Sorry I can't post this in the Paranoid Android thread yet. As a noob I can't post in that forum until I have 10 posts so I'm at a loss as to where I should post this.
Anyway, I just put the new 2.1799 PA ROM on my Nexus 7. Unfortunately, I seem to have a serious battery drain when the screen is on. I have read many posts where people claim to have easily achieved 6+ hours of active screen time per battery charge whereas I'm only getting 3-4 hours of active screen time per charge, almost all of it related to web surfing. I have a strong wifi signal and I keep my screen brightness around 20/30 range. I'm not sure if it's the ROM or if my battery is defective.
I have also read about a battery calibration app through a different thread. Is that necessary for the PA ROM? I didn't see anything in the tutorial mentioning a battery calibration.
Included are two pictures, although they aren't very indicative of my problem as my tablet was sitting in my backpack for most the day.
Please tell me I'm just being paranoid! Thank you for the help!
Click to expand...
Click to collapse
The battery recalibration is a myth, but there is also no harm in trying it.
according to the pics you have attached, there doesn't seem to be anything wrong.
Battery also drains faster if you have too many apps that have services running.
Ex: Facebook.
I know there is a battery warranty, but how bad does it have to be to get it replaced? My battery cannot reach the 9.5hrs of 720p video playback (with headphones in) as achieved by Asus. I can only get 8hrs. From normal usage, I am only able to get 6 hours.
The ROM has less to do with the battery than the kernel does.
I would say try flashing another kernel. The default cyanogenmod kernel that comes with Paranoid Android didn't give me very good battery life.
Franco kernel gives me excellent battery life. Other good ones for battery are Faux or Motley.
You might like reading this thread about kernels and battery life.
http://forum.xda-developers.com/showthread.php?t=1889571
Sent from my Paranoid Nexus 7
AlleN7 said:
I know there is a battery warranty, but how bad does it have to be to get it replaced? My battery cannot reach the 9.5hrs of 720p video playback (with headphones in) as achieved by Asus. I can only get 8hrs. From normal usage, I am only able to get 6 hours.
Click to expand...
Click to collapse
That is in the normal range i would say, Companies usually exaggerate.
As suggested try franco's kernel.
He has a free kernel flashing app on the play store.
My issue is with how the battery percentage is running down......
Charge the N7 to max and use it for a good 2 hours and the battery STILL reads 100%.
Even if I then shut down and reboot it still shows 100%, then all of a sudden it will start to drop very slowly at first until it gets to around 40% which it then shuts down and will not reboot, obviously void of any battery cells.
Clearly it's a calibration issue.
This is on a stock non-rooted machine.
vinny86 said:
That is in the normal range i would say, Companies usually exaggerate.
As suggested try franco's kernel.
He has a free kernel flashing app on the play store.
Click to expand...
Click to collapse
I tried his kernal. I did my video play back test and I got the same 8 hours as before. During normal usage I think I will get about 30-40 more minutes. Still not what others are getting
Beards said:
My issue is with how the battery percentage is running down......
Charge the N7 to max and use it for a good 2 hours and the battery STILL reads 100%.
Even if I then shut down and reboot it still shows 100%, then all of a sudden it will start to drop very slowly at first until it gets to around 40% which it then shuts down and will not reboot, obviously void of any battery cells.
Clearly it's a calibration issue.
This is on a stock non-rooted machine.
Click to expand...
Click to collapse
Try a factory reset. If that doesn't work, you're more than likely actually looking at it being a hardware issue.
Sent from my Nexus 7 using Tapatalk 2
najaboy said:
Try a factory reset. If that doesn't work, you're more than likely actually looking at it being a hardware issue.
Sent from my Nexus 7 using Tapatalk 2
Click to expand...
Click to collapse
Factory reset was the very first thing I tried when it started playing up.... I'm hoping when 4.1.2 rolls out it may clear it. If not then I'll have to look at doing a root and access the battery file to see if deleting may help.
Thing is a recharge should clear out the battery file stats and calibrate, which clearly it's not.
Apart from this the N7 is flawless so it's staying with me. Running hours is the same, just doesn't give an accurate reading of how the battery is running down.
It's not a big issue.... to be honest I'm more curious than annoyed.
Beards said:
Factory reset was the very first thing I tried when it started playing up.... I'm hoping when 4.1.2 rolls out it may clear it. If not then I'll have to look at doing a root and access the battery file to see if deleting may help.
Thing is a recharge should clear out the battery file stats and calibrate, which clearly it's not.
Apart from this the N7 is flawless so it's staying with me. Running hours is the same, just doesn't give an accurate reading of how the battery is running down.
It's not a big issue.... to be honest I'm more curious than annoyed.
Click to expand...
Click to collapse
Have you tried installing a 3rd party battery app to see if it registers the correct battery output? This is the one I have used, works good. GL
https://play.google.com/store/apps/details?id=net.hubalek.android.reborn.beta&hl=en
snipe2nite said:
Have you tried installing a 3rd party battery app to see if it registers the correct battery output? This is the one I have used, works good. GL
https://play.google.com/store/apps/details?id=net.hubalek.android.reborn.beta&hl=en
Click to expand...
Click to collapse
Yes thanks.... Tried quite a few. Nothing changes.
Beards said:
Factory reset was the very first thing I tried when it started playing up.... I'm hoping when 4.1.2 rolls out it may clear it. If not then I'll have to look at doing a root and access the battery file to see if deleting may help.
Thing is a recharge should clear out the battery file stats and calibrate, which clearly it's not.
Apart from this the N7 is flawless so it's staying with me. Running hours is the same, just doesn't give an accurate reading of how the battery is running down.
It's not a big issue.... to be honest I'm more curious than annoyed.
Click to expand...
Click to collapse
You do realize that wiping batterystats.bin has absolutely nothing to do with the battery fuel gauge, right? It does not "calibrate" the battery or affect reported charge. The myth of wiping battery stats has long since been debunked by Google's Android engineers. The only info contained in the file is a list of apps that used battery since the last full charge.
The only other thing you could do besides a factory reset is see if 4.1.2 fixes it for you. If not, then it's definitely hardware causing the issue- the battery charge is likely being improperly read and reported by the battery itself.
Sent from my Nexus 7 using Tapatalk 2

N7 JB 4.2 strange charging issue

My stock unrooted 16gb n7 received the 4.2 update this morning, all has been fine until this evening when it needed charge.
It often gets plugged into a htc phone charger, which has worked fine since i bought the tab a few months ago until today, its a 1amp charger so it takes ages to charge, but thats fine as it is plugged in until the morning normally.
So i plugin as normal, and come back after setting up google play music on my desktop pc, and i see the unit rebooting showing the glowing X. The screen goes blank and is unresponsive, eventually the google logo appears and it boots normally (its still plugged in btw), after unlocking the screen goes mental after maybe 5 seconds with random noise on it, then goes black.
So i unplug and use the genuine asus charger and cable, it does the same twice over, reboot, freeze, long wait then reboot.
I have now left it on charge using the asus charger and it seems to be ok now
Have google changed some charging requirements? Anyone else seen this?
Sent from my Nexus 7 using xda premium
Not sure, but my nexus 7 on Android 4.2 charges like 35% slower than did with 4.1.2..... what the hell did they do??
Funny you mention that, i might agree with you there
The N7 seems fine today, i did make a couple of videos of it misbehaving last night, watching back my circle battery widget app jumps from 16% to 0% battery just before it goes blank, indicating it might have simply run flat but thought it still had 16% battery?
Wonder if they have changed the battery meter scaling?
I think i will run it flat and check it shuts down properly like it used to
Sent from my Nexus 7 using xda premium
dexterslab said:
Funny you mention that, i might agree with you there
The N7 seems fine today, i did make a couple of videos of it misbehaving last night, watching back my circle battery widget app jumps from 16% to 0% battery just before it goes blank, indicating it might have simply run flat but thought it still had 16% battery?
Wonder if they have changed the battery meter scaling?
I think i will run it flat and check it shuts down properly like it used to
Sent from my Nexus 7 using xda premium
Click to expand...
Click to collapse
Hi dexterslab,
On a side note when you update to 4.2 were you already rooted and did you have superSU version0.98 installed? I have been reading other posts in this forum that folks have been rooted, superSU installed and the update has completely crashed their N7. ANy info would be greatly appreciated.
Thanks,
JBIRD
Its still as stock, locked and unrooted
Sent from my Nexus 7 using xda premium
I've noticed slower charging since the 4.2 update too - did a quick Google search and landed here. Using the same genuine Asus charger and generic cable that I did before the update, and I would agree with the roughly 35% slower estimate.
dexterslab said:
Its still as stock, locked and unrooted
Sent from my Nexus 7 using xda premium
Click to expand...
Click to collapse
Thanks, did you do a factory reset prior to updating?
No, update received ota so just installed it
Sent from my Nexus 7 using xda premium
Been working and charging fine since, guess it was just a random glitch!?
Sent from my Nexus 7 using xda premium
scubastevegk said:
I've noticed slower charging since the 4.2 update too - did a quick Google search and landed here. Using the same genuine Asus charger and generic cable that I did before the update, and I would agree with the roughly 35% slower estimate.
Click to expand...
Click to collapse
Are you using the new Daydream feature (you can find it in the display settings). If yes this may be the cause of slower charging, because it doesn't turn of the display.
Daydream is off.
Tbh, now it seems to have settled down i think maybe charging time is pretty much the same as it was. The whole debacle seems to be a complete non-event in hindsight!
Sent from my Nexus 7 using xda premium
Guhrasoh said:
Are you using the new Daydream feature (you can find it in the display settings). If yes this may be the cause of slower charging, because it doesn't turn of the display.
Click to expand...
Click to collapse
No Daydream for me.
Mine is stock and unrooted. After the update I'm having the same charging issues. Incredibly slower charging. It's been plugged in for 6 hours now and it's at 80%. I did play a bit of pandora for about 30minutes but it was still plugged in. Other than that I haven't touched it other than to check the level. I turned daydream. Let's see if that help though I doubt it.
i think when you install the 4.2 update it does a battery stat wipe. this could produce the battery jumping from 16%-0% i reset the battery stats on my gt-i9003 the other day charged, its went from 100% - 40% instantly after about 2 charge cycles it should go back to normal.
it would also explain the battery seeming to take longer to charge, its just the voltage counter resetting itself. it might even in some cases charge faster....then run out quicker....
charge- discharge about 3 times and it should go back to norm.:good:
example :
dexterslab said:
Tbh, now it seems to have settled down i think maybe charging time is pretty much the same as it was. The whole debacle seems to be a complete non-event in hindsight!
Click to expand...
Click to collapse
still bro i wouldnt use any charger expect the asus one, phones maybe i mean i always use other peoples chargers,or pickup the wrong end from my snake-pit of charger cables hanging under my tv unit. but for tabs....nah lol
chismay said:
i think when you install the 4.2 update it does a battery stat wipe. this could produce the battery jumping from 16%-0% i reset the battery stats on my gt-i9003 the other day charged, its went from 100% - 40% instantly after about 2 charge cycles it should go back to normal.
it would also explain the battery seeming to take longer to charge, its just the voltage counter resetting itself. it might even in some cases charge faster....then run out quicker....
charge- discharge about 3 times and it should go back to norm.:good:
example :
still bro i wouldnt use any charger expect the asus one, phones maybe i mean i always use other peoples chargers,or pickup the wrong end from my snake-pit of charger cables hanging under my tv unit. but for tabs....nah lol
Click to expand...
Click to collapse
Agreed, phones seem to be more universally compatible when it comes to charges.
Charge a tab with the wrong charger n you'll make up with a melted Nexus 7
i think its a part of certain regulations now that mobile phones needs to have an internal capacitor/transformer to make sure of this problem, as people usually run out of charge on the go and use other chargers as long as the connector fits and it begins charging, most of us including me are probably guilty of plugging a charger in, seeing its charging and thinking *yay it works fine* walking away and not really understanding what slow-fast damage can be caused to the device/battery.
for tabs 30% i would say dont have this feature:good: especially the Chinese ones. ? <no racial offence intended> you guys know what im on about.
My Nexus 7 worked great before upgrading to 4.2. Now it can't charge while I'm using it... The battery just goes up and down as I'm surfing the web, if I load a lot of pages, it goes down, if I read a lot, it goes up... But if I try to watch a floating video while surfing the web, it just goes down... There is definitely a problem! Here is a screenshot... I'm using the original charger and cable...
chismay said:
i think when you install the 4.2 update it does a battery stat wipe. this could produce the battery jumping from 16%-0% i reset the battery stats on my gt-i9003 the other day charged, its went from 100% - 40% instantly after about 2 charge cycles it should go back to normal.
it would also explain the battery seeming to take longer to charge, its just the voltage counter resetting itself. it might even in some cases charge faster....then run out quicker....
charge- discharge about 3 times and it should go back to norm.:good:
example :
still bro i wouldnt use any charger expect the asus one, phones maybe i mean i always use other peoples chargers,or pickup the wrong end from my snake-pit of charger cables hanging under my tv unit. but for tabs....nah lol
Click to expand...
Click to collapse
Wiping battery stats does absolutely nothing that affects reported battery charge level. That wives' tale was long ago debunked by a member of Google's Android team. The one and only thing you are wiping is a list of apps that have operated on battery since unplugging after the last complete charge. This in no way, shape, or form affects reported charge or has any effect on battery life whatsoever.
Sent from my Galaxy Nexus using Tapatalk 2
najaboy said:
Wiping battery stats does absolutely nothing that affects reported battery charge level. That wives' tale was long ago debunked by a member of Google's Android team. The one and only thing you are wiping is a list of apps that have operated on battery since unplugging after the last complete charge. This in no way, shape, or form affects reported charge or has any effect on battery life whatsoever.
Sent from my Galaxy Nexus using Tapatalk 2
Click to expand...
Click to collapse
LIKE I AM SAYING MY FRIEND,
actually the battery stats ARE WHAT THE GOOGLE DEV SAID is what gives you accurate readings it doesn't increase your battery life . i never said that it will, so please don't police me,.
heres the comment
This file [batterystats.bin] is used to maintain, across reboots, low-level data about the kinds of operations the device and your apps are doing between battery changes. That is, it is solely used to compute the blame for battery usage shown in the "Battery Use" UI in settings. That is, it has deeply significant things like "app X held a wake lock for 2 minutes" and "the screen was on at 60% brightness for 10 minutes."
when you flash a new firmware, the system must calibrate as there are no previous readings from the bstat file right?.,these are the readings that help the system produce the reported battery charge. its what it does to give you those readings, i was guiding the above member to wait and run a few cycles for readings to be more accurate i never said his battery was dead.
kinda why pretty much EVERYONE mentions after flashing a new firmware on most device they have a few days of battery "up-n-downs"= counter reset/data collection/last battstat file wiped.
cheers:good:
chismay said:
LIKE I AM SAYING MY FRIEND,
actually the battery stats ARE WHAT THE GOOGLE DEV SAID is what gives you accurate readings it doesn't increase your battery life . i never said that it will, so please don't police me,.
heres the comment
This file [batterystats.bin] is used to maintain, across reboots, low-level data about the kinds of operations the device and your apps are doing between battery changes. That is, it is solely used to compute the blame for battery usage shown in the "Battery Use" UI in settings. That is, it has deeply significant things like "app X held a wake lock for 2 minutes" and "the screen was on at 60% brightness for 10 minutes."
when you flash a new firmware, the system must calibrate as there are no previous readings from the bstat file right?.,these are the readings that help the system produce the reported battery charge. its what it does to give you those readings, i was guiding the above member to wait and run a few cycles for readings to be more accurate i never said his battery was dead.
kinda why pretty much EVERYONE mentions after flashing a new firmware on most device they have a few days of battery "up-n-downs"= counter reset/data collection/last battstat file wiped.
cheers:good:
Click to expand...
Click to collapse
Read her entire dissertation, and you will see that it does not pertain to reported charge level. She explicitly states that batterystats.bin has no bearing on reported charge level. Interesting that you left out the portions of her post immediately prior to, and immediately following, the part of her post that you quoted... you know, the ones where she states, and then restates, that nothing in batterystats.bin affects the reported charge level? Also, the reason the battery seems more stable a few days after flashing new firmware is the kernel itself settling, not the OS.
Sent from my Nexus 7 using Tapatalk 2

Device very hot + battery drain since update

Just wanted to know if anyone else has problems with their Nexus 4 since the latest update?
So far, within 24 hours I have had to charge my phone twice fully.
What the hell is going on?
Thanks
Pixulated said:
Just wanted to know if anyone else has problems with their Nexus 4 since the latest update?
So far, within 24 hours I have had to charge my phone twice fully.
What the hell is going on?
Thanks
Click to expand...
Click to collapse
What do the battery stats show?
Maybe this will solve your problem.
danielms22 said:
What do the battery stats show?
Maybe this will solve your problem.
Click to expand...
Click to collapse
mine today started to get really hot.... it froze
upon reboot, it lost like 30% battery...
froze again in landscape mode
after a few reboots it continue to run super hot... like 65*
battery is draining even faster than what Ingress. uses
still occurs in safe mode
is the hardware going bad? i saw a few other folks having this also happen in the last week without ant solutions
chaco81 said:
mine today started to get really hot.... it froze
upon reboot, it lost like 30% battery...
froze again in landscape mode
after a few reboots it continue to run super hot... like 65*
battery is draining even faster than what Ingress. uses
still occurs in safe mode
is the hardware going bad? i saw a few other folks having this also happen in the last week without ant solutions
Click to expand...
Click to collapse
Well then, since you replied to my post above... What did the battery stats show? Are Google services the problem?
danielms22 said:
Well then, since you replied to my post above... What did the battery stats show? Are Google services the problem?
Click to expand...
Click to collapse
i have had my current setup since i got the phone.. AOKP, Franco Kernel, undervolted -25mv, with like 215 total apps.... decent battery like, usually about 3 hrs SOT...
but yesterday was among weird to say the least.... Franco monitor will show my CPU was up to 170* at one point... but yet, my CPU usage on my monitor was with core 0-1 being less than half throtle while core 2-3 were offline... so i thought it was weird that my CPU would be so hot, yet not ON....it was so hot the phone would shutdown as soon as it got booted...
then my battery was not hot, but draining incredibly fast.... like from 88% to 19% in less than 2 hrs....
my battery usage pretty much displayed that it was the Screen consuming most of my battery.... i didnt notice GS being a problem, but im sure i would have noticed if it was
So far, i went ahead and factory reset, formatted /system /cache /data and dalvik... installed my rom again fresh.... its not acting up yet.... but for some reason i cant shake the fact its using battery much faster... i went earlier in my break from 94% to 87% in less than 10 minutes... thats not normal..maybe its just me..
so tonight i am going to reformat everything a couple times, install all fresh and see what happens before i restore everything back in the phone.
chaco81 said:
i have had my current setup since i got the phone.. AOKP, Franco Kernel, undervolted -25mv, with like 215 total apps.... decent battery like, usually about 3 hrs SOT...
but yesterday was among weird to say the least.... Franco monitor will show my CPU was up to 170* at one point... but yet, my CPU usage on my monitor was with core 0-1 being less than half throtle while core 2-3 were offline... so i thought it was weird that my CPU would be so hot, yet not ON....it was so hot the phone would shutdown as soon as it got booted...
then my battery was not hot, but draining incredibly fast.... like from 88% to 19% in less than 2 hrs....
my battery usage pretty much displayed that it was the Screen consuming most of my battery.... i didnt notice GS being a problem, but im sure i would have noticed if it was
So far, i went ahead and factory reset, formatted /system /cache /data and dalvik... installed my rom again fresh.... its not acting up yet.... but for some reason i cant shake the fact its using battery much faster... i went earlier in my break from 94% to 87% in less than 10 minutes... thats not normal..maybe its just me..
so tonight i am going to reformat everything a couple times, install all fresh and see what happens before i restore everything back in the phone.
Click to expand...
Click to collapse
I'm with the same problem you're with. I did format everything, and the problem persists, can't really find the culprit on this.
I'm using PA 3.99 + FK, but I've tried with stock and cm, with stock kernels also.
Please let us know if you did solve the problem, and how did it, because this is becoming difficult to manage the use of this phone for me, having to carry the charger everywhere I go.
Sent from my Nexus 4 using Tapatalk 4
magote said:
I'm with the same problem you're with. I did format everything, and the problem persists, can't really find the culprit on this.
I'm using PA 3.99 + FK, but I've tried with stock and cm, with stock kernels also.
Please let us know if you did solve the problem, and how did it, because this is becoming difficult to manage the use of this phone for me, having to carry the charger everywhere I go.
Sent from my Nexus 4 using Tapatalk 4
Click to expand...
Click to collapse
So battery life has been horrendous. It dies much faster and takes long to charge. My car charger no longer charges the phone... yet my Gnex and N7 FHD charges on that charger fine....
Qi charging works fine too (thats next to my bed)
So i called assurant, which sent me to Tmo, which sent me to Google (got it at play store) and they are sending me a new unit, since this one will be covered until manufacturer warranty for malfunction, not physical damage
Im sorry i will not have a resolution, i will revert back to stock and re lock it before i sent it back.... Hopefully i get a good one and not one with issues...

[Q] Miscalibrated battery, need help!

I need some suggestions on how to calibrate the battery on my n4. It got miscalibrated when I did the update 4.2 to 4.3 and I haven't been able to calibrate it since then, a week ago.
I tried using battery calibration from the store but it didn't work, I tried charging the phone from 0 to 100 and it didn't work.
I remember I had the same problem 2 years ago with my Atrix and I solved it by wiping the battery stats from recovery, but now twrp and Cwm removed this feature and I don't know how to solve my problem.
Maybe it would help flashing all back to stock with the toolkit?
If you have any suggestions I'd really appreciate it.
http://forum.xda-developers.com/showthread.php?t=1460553
qoolix said:
http://forum.xda-developers.com/showthread.php?t=1460553
Click to expand...
Click to collapse
Just the answer I didn't expected, and frankly a pretty useless answer, everybody knows that battery calibration doesn't improve battery life.
But I have other problems, like I turn off my device at 80% and when I turn it on it's at 77%. Do you think that's normal?
Elwood_It said:
Just the answer I didn't expected, and frankly a pretty useless answer, everybody knows that battery calibration doesn't improve battery life.
But I have other problems, like I turn off my device at 80% and when I turn it on it's at 77%. Do you think that's normal?
Click to expand...
Click to collapse
Either faulty battery or do the following:
1.Completley discharge N4
2.Charge fully(+2 hours after hitting 100&) WITHOUT disconnecting from the charger.
3.Repeat for better results.
Sent from my Nexus 4 using xda app-developers app
failly said:
Either faulty battery or do the following:
1.Completley discharge N4
2.Charge fully(+2 hours after hitting 100&) WITHOUT disconnecting from the charger.
3.Repeat for better results.
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
Thanks for the answer. Should I carghe while it's off or on or it doesn't matter?
Elwood_It said:
Thanks for the answer. Should I carghe while it's off or on or it doesn't matter?
Click to expand...
Click to collapse
To be honest, I don't know.
But if I would be you I would just let it charge while it's off(So the big ass white battery icon).
Let me know if you got your battery sorted after the method I posted!
Elwood_It said:
Just the answer I didn't expected, and frankly a pretty useless answer, everybody knows that battery calibration doesn't improve battery life.
But I have other problems, like I turn off my device at 80% and when I turn it on it's at 77%. Do you think that's normal?
Click to expand...
Click to collapse
You mean off as in all the way off? If so, then that ~3% is being used when the phone boots.
korockinout13 said:
You mean off as in all the way off? If so, then that ~3% is being used when the phone boots.
Click to expand...
Click to collapse
I've had many phones, and none of them lost charge during the boot, at least not that many. I think that's the clear sign of battery miscalibration, I've had this problem before with another phone. Besides that, I've had a strange behaviour of the battery, for example I saw it lose 4% in 1 second, from 66 to 62 in a blink of an eye.
Elwood_It said:
I've had many phones, and none of them lost charge during the boot, at least not that many. I think that's the clear sign of battery miscalibration, I've had this problem before with another phone. Besides that, I've had a strange behaviour of the battery, for example I saw it lose 4% in 1 second, from 66 to 62 in a blink of an eye.
Click to expand...
Click to collapse
It's not that it's losing charge quickly, it's just the OS (or the hardware itself) doesn't always do the best job of reading it. There's not much you can do about that, and it's really not an issue unless you make it so by staring at your battery level all day.
korockinout13 said:
It's not that it's losing charge quickly, it's just the OS (or the hardware itself) doesn't always do the best job of reading it. There's not much you can do about that, and it's really not an issue unless you make it so by staring at your battery level all day.
Click to expand...
Click to collapse
Hi,
I'm having a similar issue. Phone rebooting to weird battery levels (not the %age it shutdown at).
Phone shutting down at 31% battery and rebooting to 0%.
I tried charging only to 100% yesterday with the phone ON.
Do I have to charge it even after it's charged to 100%?
failly said:
To be honest, I don't know.
But if I would be you I would just let it charge while it's off(So the big ass white battery icon).
Let me know if you got your battery sorted after the method I posted!
Click to expand...
Click to collapse
I tried charging through the night and then discharging it completely and charging it completely again. I also tried deleting the batterystats file (even though I know it doesn't do anything)
So what do you suggest I should do? Get the phone replaced or get the battery changed?
I live in India and the phone is from Canada, so replacing the phone will take some time but I can get the battery replaced for around $20
Also my nexus is also showing +ve mA values while it's not charging, and the values are absolutely crazy, +268, +168, +1171 (in batter monitor widget)
Please tell me what I should do.
japmeet said:
I tried charging through the night and then discharging it completely and charging it completely again. I also tried deleting the batterystats file (even though I know it doesn't do anything)
So what do you suggest I should do? Get the phone replaced or get the battery changed?
I live in India and the phone is from Canada, so replacing the phone will take some time but I can get the battery replaced for around $20
Also my nexus is also showing +ve mA values while it's not charging, and the values are absolutely crazy, +268, +168, +1171 (in batter monitor widget)
Please tell me what I should do.
Click to expand...
Click to collapse
Before you replace the battery try to disconnect the battery's flex cable and reconnect it [after you charge to device to 100% and turn it off of course] check if its 'reset' the battery.

Shuts down as if low-battery, but with 50% - 95% left!

This has been driving me nuts for ages, and now I just use the battery to transfer my phone from one charger to another! But to be honest I haven't tried anything to fix it as yet.
It started with my phone shutting down when I took a few photos - now, if my phone gets down to 80% I expect it to shutdown. It won't fire back up until I put it on charge.
Occasionally when I try to turn it back on, it wont fire up, and the blue LED comes on and stays on until I charge it or take the battery out.
Occasionally it will reach 50%, but that would be a rare occasion! I do still have the original battery, which is now over two years old.
It's a great phone - if only the battery would last longer than 10 minutes under use! It hasn't been rooted or anything - it is as I got it from new.
Any help would be greatly appreciated.
TIA
magicdrshoon said:
I do still have the original battery, which is now over two years old.
Click to expand...
Click to collapse
A new battery is really cheap ( 15-25 usds) and probably would solve your problem.
There is no reason for this topic unless you have the original battery.
magicdrshoon said:
This has been driving me nuts for ages, and now I just use the battery to transfer my phone from one charger to another! But to be honest I haven't tried anything to fix it as yet.
It started with my phone shutting down when I took a few photos - now, if my phone gets down to 80% I expect it to shutdown. It won't fire back up until I put it on charge.
Occasionally when I try to turn it back on, it wont fire up, and the blue LED comes on and stays on until I charge it or take the battery out.
Occasionally it will reach 50%, but that would be a rare occasion! I do still have the original battery, which is now over two years old.
It's a great phone - if only the battery would last longer than 10 minutes under use! It hasn't been rooted or anything - it is as I got it from new.
Any help would be greatly appreciated.
TIA
Click to expand...
Click to collapse
Your battery needs to be replaced..
Dial *#0228# this will reset the battery calibration. Charge it to 100%..
see if the problem still remains that means your battery is almost dead and expect a random shutdowns at anytime
Sent from my SM-N910G using Tapatalk
heisenberg7 said:
A new battery is really cheap ( 15-25 usds) and probably would solve your problem.
There is no reason for this topic unless you have the original battery.
Click to expand...
Click to collapse
I understand that the battery is probably past it's best, but it was the fact that it states that it has lots of life left, and then acts as if it doesn't that throws me. That's the reason why I have posted this topic.
Amar.B said:
Your battery needs to be replaced..
Dial *#0228# this will reset the battery calibration. Charge it to 100%..
see if the problem still remains that means your battery is almost dead and expect a random shutdowns at anytime
Sent from my SM-N910G using Tapatalk
Click to expand...
Click to collapse
I've done this now. Thanks for the tip. It doesn't seem to have made any difference though so it's probably just the battery.
I just expected it to indicate the correct battery level in the battery level indicator.
You live and learn! Thanks for the replies.
magicdrshoon said:
I understand that the battery is probably past it's best, but it was the fact that it states that it has lots of life left, and then acts as if it doesn't that throws me. That's the reason why I have posted this topic.
I've done this now. Thanks for the tip. It doesn't seem to have made any difference though so it's probably just the battery.
I just expected it to indicate the correct battery level in the battery level indicator.
You live and learn! Thanks for the replies.
Click to expand...
Click to collapse
Anytime mate.. cheers
Sent from my SM-N910G using Tapatalk

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