What's-up Epic4GT Community... Quick question, my battery will suddenly go from 70% to 20%. It is not always at 70% when it drops, it will happen at various percentages. I have attempted to calibrate/wipe battery stats with no avail. Could it be kernel related? Rom related? Bad battery? Any help with my issue would be much appreciated. Thanx!
wiping battery stats has been proven to do nothing. it does sound like a bad battery to me. have you tried using betterbatterystats and cpu spy to see what the problem is?
Does this happen after your phone reboots or in some other fashion turns off then back on, or while the phone is awake?
Right on patrao thank you for the response... Downloading betterbatterystats to see if I can narrow down the problem.
lickarock said:
Does this happen after your phone reboots or in some other fashion turns off then back on, or while the phone is awake?
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It seems to happen sometimes after a reboot or when simply awakening phone. Usually happens when it hits around 60%... My device will be in sleep mode, then when I go to use it, will notice that the battery has dropped 40%. Havent seen it drop while the phone is awake though.
Had the same issue when I first got mine. I was able to "fix" it by draining completely, wiping battstats, then charging full again. Haven't had the problem since UNLESS I'm using a non-stock battery.
In that case it will do it from time to time. Haven't found resolution for that case yet.
Sent from my SPH-D710 using xda premium
jasone4gt said:
Right on patrao thank you for the response... Downloading betterbatterystats to see if I can narrow down the problem.
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no problem man hope you find it out. if not I would go to sprint and tell them your battery is ridiculous at holding a charge
I have a similar problem! Whenever I do a battery pull, then boot back up, I lose anywhere from 10-60% of my battery. I've gone through two batteries and two phones with the same problem.
ive had similar things happened to me. my battery went from 80% to 40%. at first i was like wtf! then i did a rebbot and battery went back to 80%
klyang88 said:
ive had similar things happened to me. my battery went from 80% to 40%. at first i was like wtf! then i did a rebbot and battery went back to 80%
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This is the same thing that would happen to me. Also like others have said are you sure your phone isnt rebooting? When this happens go to about phone, status and check the up time. When I first rooted my phone it would reboot all the time without me knowing. Honestly sometimes up to 10 times a day. I flashed it back to stock and re rooted using the latest method and now my phone has rebooted once in about 3 months. I have a feeling the first time I rooted something went wrong somewhere because now my phone is running better than ever and rock solid stable!
---------- Post added at 04:09 PM ---------- Previous post was at 04:04 PM ----------
Another thing I should note is I noticed you are running the fb21 modem. That modem was nothing but pure hell on my battery watching it drain the battery was like watching a minute hand on the clock. I would get maybe 6 hours of moderate use. Switch to the fb15 modem and see if that helps. With fb 15 my battery life has been incredible.
Right on fellas thank you for your responses...
Same problem I had. Issue fixed itself maybe because I let the battery drain. Another fix I found was rebooting restored lost %...
This seems to be an inherent problem in certain Samsung builds. My old OG Epic would do this all the time after a reboot. This one would do it at first... but I have never had the problem on el29. When I tried out fb17 with the fb15 modem it came back. And it was always after a reboot. What was funny is that my battery percentage would climb without being on the charger after a plummet like that. I tend to think it is a kernel issue, with it not grabbing the correct percentage during boot.
Sent from my SPH-D710 using XDA App
I also have this issue. It happens randomly when I restart or do a full power shut down. It is very annoying and doing a battery pull does not bring it back up. Its frustrating having to plug your phone in when you had 60-80% battery life left b4 the shut down
Sent from my SPH-D710 using XDA App
Related
I rooted my e4gt to blu kuban then to cm9 and back to stock due to the battery life was rediculously low. Any thoughts as to what's happening in the pictures..you see a gradually decline and then a sudden drastic drop in the battery level. any suggestions is appreciated. I bought it 2 weeks ago and the battery use to hold a good 19hr charge. BUUTTTT then if you look at the second picture its still holding at 20% after an hour for some reason like its not registering the full power. odd.
EDIT:
Actually if you backup your USB storage and SD card and then format both then go back to stock all is well. It seems that some temporary files are stored and when you flash over and over again it lingers around. best thing to do is format both usb and sd card before going to stock or after i havent tried it after but if u do it before you get on a clean slate. Battery life just like first day i got it ..im happy
it looks like you haven't let your battery settle yet. I've noticed it normally takes 1-2 days for your battery to settle and show you the proper usage.
The first day on a ROM always sucks for battery life.
Sent from my SPH-D710 using XDA
borkan said:
it looks like you haven't let your battery settle yet. I've noticed it normally takes 1-2 days for your battery to settle and show you the proper usage.
The first day on a ROM always sucks for battery life.
Sent from my SPH-D710 using XDA
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THank you kindly sir. Yea it just stuck at 19 now lol. I guess i will give it a day or two like you said.
bigrndahouse said:
I rooted my e4gt to blu kuban then to cm9 and back to stock due to the battery life was rediculously low. Any thoughts as to what's happening in the pictures..you see a gradually decline and then a sudden drastic drop in the battery level. any suggestions is appreciated. I bought it 2 weeks ago and the battery use to hold a good 19hr charge. BUUTTTT then if you look at the second picture its still holding at 20% after an hour for some reason like its not registering the full power. odd.
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My phone does this all the time after a restart. I can be at like 30%, restart my phone and its at 7%, ouch... Ive also noticed that sometimes while charging, it takes forever to get from 99% to 100%... Don't know what the deal is...
puff601 said:
My phone does this all the time after a restart. I can be at like 30%, restart my phone and its at 7%, ouch... Ive also noticed that sometimes while charging, it takes forever to get from 99% to 100%... Don't know what the deal is...
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Yea. it's a little crazy. I rooted my phone again and installed blu kuban with the update. It seems little better and at least sustainable. Of course its not stock battery life but till Source comes out for our phones i guess it will do. BluKuban is a great rom plus the updater is a bonus. Just updated my phone with some fixes...i ended up taking out the battery for an hour then put it back in and charge for a good 2 hours...it seems that all is well now. I dont have those sudden drops unless if im playing angry birds space or on it like crazy..
borkan said:
it looks like you haven't let your battery settle yet. I've noticed it normally takes 1-2 days for your battery to settle and show you the proper usage.
The first day on a ROM always sucks for battery life.
Sent from my SPH-D710 using XDA
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Thank you you were right..just had to let it settle then i did the battery bump thing with takin the battery out and all.Back on blu kuban and i love it
This happens quite often in a multitude of roms. It's a battery reporting issue. You don't actually lose all that battery. If you watch after it happens, your battery will go back up on it's own if it's off the charger.
Sent while hanging with that really hoopy frood Ford Prefect.
Always best to calibrate the battery after flashing me roms.if your using blu kuban reboot to recovery click wipe then click battery wipe and reboot.
So I am running UVDL|6 for some time now which works good (not great but good) and this morning I woke up to find my battery completely dead. When I went to sleep it was at a decent 55% now I highly doubt that without any use the battery just drops to 0%, So checked my battery stats and it says Android System at 70% use.. which is pretty high for an idle phone. Any ideas? Or any software I can use to pull out the culprit because Android System has so many subsets to it that it makes it really hard to pin point what causes it.
You will have to reproduce the problem, but try GSam Battery Monitor.
Aerowinder said:
You will have to reproduce the problem, but try GSam Battery Monitor.
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Reproduce the problem? Well I was a sleep so maybe ghosts were messing with my phone, I'll ask them nicely...
I think he means you need to put your phone in the same spot when you go to bed and see if it does it again. No sense in trying to fix a one time problem.
Battery stats were gone when you started the phone up I'm assuming. Good reception where you placed it?
Sent from my SGH-T999V using xda premium
Been happening to me on LI7 lately. Originally it was great on battery life, then all of a sudden I started getting insane battery drain from the Android System. I haven't really taken the time to diagnose it yet, but I need to. It gets really hot randomly sometimes then cools down and the battery just starts draining away really fast.
I saw someone mention deleting or renaming gsiff_daemon in /system/bin to solve this.
Theres a thread dedicated to the subject as well, though ive yet to actually go through it.
Anyway give that a shot and lets all hope they Completely fixed the battery issues in the final release! (Its not all from one thing in my experience with the leaks, but from multiple issues)
Sent from my SGH-T999 using xda app-developers app
Ill add my stock experience for reference as well as if anyone has a fix. I'm pretty happy with battery life coming from a Vibrant but what I notice is that usually there is minimal drain during the night ,however if I get an SMS the drain will be maximal.Like 30/40% Almost like the screen went on and never shut off but it doesn't seem to be the case. This is on the stock messenger App. If I don't get an SMS it will usually drain from like 99% to 96% roughly. Didn't mean to threadjack OP.
Sent from my SGH-T999 using xda app-developers appeal
demize! said:
Ill add my stock experience for reference as well as if anyone has a fix. I'm pretty happy with battery life coming from a Vibrant but what I notice is that usually there is minimal drain during the night ,however if I get an SMS the drain will be maximal.Like 30/40% Almost like the screen went on and never shut off but it doesn't seem to be the case. This is on the stock messenger App. If I don't get an SMS it will usually drain from like 99% to 96% roughly. Didn't mean to threadjack OP.
Sent from my SGH-T999 using xda app-developers appeal
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Have you tried running Better Battery Stats to see why the phone isn't sleeping?
Yeah battery stats were probably from when I turned the phone back on...
I started running into some battery issues earlier today. I was on AOKP without any issues and one day the battery just started draining very fast. I went from about 50% to 15% in a matter of an hour. That night I slept with my phone charging and it did to get charged passd 54%. And it's charging very slow too. I thought it might be the ROM so I flashed Slim Bean. But it is not heling at all.
Anyone have anything similar going on?
What can I do?
Try calibrating the battery and go like 2-3 charge to discharge and see what its like afterwards
Sent from my SGH-I747M using xda premium
Will do. I'll post back
Yea it takes a few rundowns to get into the sweet spot, I thought I was getting horrible battery life till someone suggested that to me now I get about 32-33 hrs on a charge. Which I think is about prefect, I don't game on it I just use everything else all the time. I have ps3, xbox360 & psp for gaming
Sent from my SGH-I747M using xda premium
Well it's been charging for about 6 hours now and it won't get past 54%
I let it charge all night and when I woke up it was finally at 100%. I left for class and unplugged my phone at 7:40. 20 minutes later it was down to 47%. Then another 2 hours later, it was at 11%. Obviously it is draining far too fast. Will AT&T replace my battery? Or does it look like I'm gonna have to buy a new one?
What I normally do is charge it to 100% then boot into recovery and wipe battery stats. Reboot and don't unplug the phone until it again says that the battery is full. Then run with it and see if it helps.
Go ask them I don't see why they wouldn't replace the battery, it does sound like its shot that kind of drain isn't normal at all
Sent from my SGH-I747M using xda premium
I had the same issues with not getting to 100%. Seems like leaving it on the charger for another couple hours (overnight) got it there.
So I went to the AT&T service shop yesterday and she took my battery and put it in a different Galaxy S III and it showed the battery was charged 97%. In my phone, it showed 23%. She told me that it had somthing to do with my phone being rooted. She said the software on my phone was being "tricked" into believing that the battery is a lot less full than it actually is. She told me to unroot my phone and flash it back to stock. So I did that yesterday and it is still no better. I don't know what to try.
Wiping battery stats doesn't help battery life... Something i learned a long time ago with my X10
Sent from my SGH-I747 using XDA Premium HD app
Here's a screenshot of my battery stats. Does Android System usually take up this much battery?
mrb1946 said:
Here's a screenshot of my battery stats. Does Android System usually take up this much battery?
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My Android system is almost always under 15%. Seeing it that high is alarming. I assume you've tried full wiping and changing ROMs?
Sent from my SGH-I747 using xda app-developers app
CamFlawless said:
My Android system is almost always under 15%. Seeing it that high is alarming. I assume you've tried full wiping and changing ROMs?
Sent from my SGH-I747 using xda app-developers app
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Yep. I must've flashed my phone to stock at least 10 times now. Ive tried rooting and Unrooting, clearing my flash counter, I really don't know what else to do.
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Thought I'd try installing CM10 just to see if there would be any difference. Screen Brightness shows up as my highest percentage on the battery usage and Android System is much lower on the list, but the battery is still not charging or discharging correctly.
mrb1946 said:
Thought I'd try installing CM10 just to see if there would be any difference. Screen Brightness shows up as my highest percentage on the battery usage and Android System is much lower on the list, but the battery is still not charging or discharging correctly.
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I would unroot and take everything back to stock, then go back to the AT&T store you went to before and show another service rep that the phone is messed up and see if they give you another one.
Good luck
ObiWanJacoby said:
I would unroot and take everything back to stock, then go back to the AT&T store you went to before and show another service rep that the phone is messed up and see if they give you another one.
Good luck
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Looks like this is my next course of action. Thanks for your help and I'll post back with whatever happens.
mrb1946 said:
I let it charge all night and when I woke up it was finally at 100%. I left for class and unplugged my phone at 7:40. 20 minutes later it was down to 47%. Then another 2 hours later, it was at 11%. Obviously it is draining far too fast. Will AT&T replace my battery? Or does it look like I'm gonna have to buy a new one?
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mrb1946,
Even though your S3 is reporting percentage values as you stated....the PHYSICAL battery did not drain from a real 100% to a real 47% in 20 minutes. It can't actually physically drain that fast. It would be on FIRE! So, either the calibration of the rom/software or the battery itself somehow messed up.
Also, during that time...was the battery/S3 HOT? That physical evidence would account for some of the drain if it's coming from a rogue app or misbehaving rom component. Did you post a battery drain graph? And were you monitoring the cpu activity during these high drain periods? I mean...periodic checks to see if your CPU is stuck on HIGH freq and if you have any wakelocks shown under the battery graph.
If this problem is still occurring, here's a thread explaining a possible drain from android system. http://forum.xda-developers.com/showthread.php?t=1827087&highlight=android+system
On my E4GT, this has happened on multiple roms and persists through wiping battery stats. Is my battery drops very fast, just 30% in ~20 minutes this morning listening to music. But then while it sits in my pocket, asleep, the battery crawls up from ~70 back up to ~90 over the course of a half-hour or so. How can I fix it or is my battery just starting to go? Also after a reboot the battery will drop like 30-40%, then slowly crawl back up.
Sounds like the battery is either on its way out (check for bulges) or just very poorly calibrated. One of my batteries did the slowly crawling up thing even when it was brand new.
Sent from my SPH-D710 using xda app-developers app
Beremat said:
Sounds like the battery is either on its way out (check for bulges) or just very poorly calibrated. One of my batteries did the slowly crawling up thing even when it was brand new.
Sent from my SPH-D710 using xda app-developers app
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Okay, well, since wiping battery stats did not help. I felt it and can't really tell if it's swelling, I think it may be a little. Is turning it off all the way, then charge without stopping the charge the only way to calibrate it?
piexil said:
Okay, well, since wiping battery stats did not help. I felt it and can't really tell if it's swelling, I think it may be a little. Is turning it off all the way, then charge without stopping the charge the only way to calibrate it?
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Click to collapse
To check for swelling lay battery on table.. Spin.. (both sides) if it spins like a top.. It's bad. Easiest way to tell, and not an uncommon problem.
Wiping battery stats does nothing. This phone automatically wipes battery stats at 100% charge.
Sent from my SPH-D710 using xda premium
Always can change phone operator too.. Sometimes fixes the issue. :laugh:
piexil said:
On my E4GT, this has happened on multiple roms and persists through wiping battery stats. Is my battery drops very fast, just 30% in ~20 minutes this morning listening to music. But then while it sits in my pocket, asleep, the battery crawls up from ~70 back up to ~90 over the course of a half-hour or so. How can I fix it or is my battery just starting to go? Also after a reboot the battery will drop like 30-40%, then slowly crawl back up.
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Click to collapse
This has to do with the way ICS reads you battery %. If it is going up on it's own then the % it tells you is just wrong. There is not much you can do to fix it except don't flash things all the time. It usually will happen when you are flashing things.
The battery being bad is also an option but I have never seen it go up on it's own when the battery is bad.
rujelus22 said:
This has to do with the way ICS reads you battery %. If it is going up on it's own then the % it tells you is just wrong. There is not much you can do to fix it except don't flash things all the time. It usually will happen when you are flashing things.
The battery being bad is also an option but I have never seen it go up on it's own when the battery is bad.
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Mine did it while it was swollen, it would drop way down real fast and then when it was on standby in my pocket "recharge" itself. Talk about weird put it in my pocket at 40% get a text check it and be at 70% like wtf do I have a charger in my pocket
Sent from my SPH-L710
-EViL-KoNCEPTz- said:
Mine did it while it was swollen, it would drop way down real fast and then when it was on standby in my pocket "recharge" itself. Talk about weird put it in my pocket at 40% get a text check it and be at 70% like wtf do I have a charger in my pocket
Sent from my SPH-L710
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Click to collapse
Phone was just happy to see you evil.
Sent from my SPH-D710 using Tapatalk 2
So, my battery is wack... and I think it's only been acting like this since I went to a KK ROM? Maybe? Feels like it...
I've had this tablet since it was released last fall, and this behavior is very recent.
Anyways, it dies FAST. Like nose dives in a matter of 5-15 minutes. What's even weirder, is that sometimes, if I power cycle the device, it'll jump up by 30-60%. But then just dies again in another 5-15 minutes.
And there's a screenshot after I just power-cycled.
It jumped from 11% to 71%!!
Crazy!
I've also tried letting it get to 5% then charging it to 100%, done that twice. No luck. I don't know if this is related, but if I power it completely off, and plug it in, it turns on... kinda weird. My Note 3 doesn't do that, it just stays off and shows the battery charge indicator.
NaxIonz said:
So, my battery is wack... and I think it's only been acting like this since I went to a KK ROM? Maybe? Feels like it...
I've had this tablet since it was released last fall, and this behavior is very recent.
Anyways, it dies FAST. Like nose dives in a matter of 5-15 minutes. What's even weirder, is that sometimes, if I power cycle the device, it'll jump up by 30-60%. But then just dies again in another 5-15 minutes.
And there's a screenshot after I just power-cycled.
It jumped from 11% to 71%!!
Crazy!
I've also tried letting it get to 5% then charging it to 100%, done that twice. No luck. I don't know if this is related, but if I power it completely off, and plug it in, it turns on... kinda weird. My Note 3 doesn't do that, it just stays off and shows the battery charge indicator.
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Hi, I have similar problem and I am with 4.3 android. I have battery loss when I play games. It drops to 2-3% really fast and after reboot it goes up to 35-40%. Once I fully depleted my battery and charge it. This time there were no battery lost. After the second charging problem persists.
If you manage to fixed it please tell us how.
Rupar4o said:
Hi, I have similar problem and I am with 4.3 android. I have battery loss when I play games. It drops to 2-3% really fast and after reboot it goes up to 35-40%. Once I fully depleted my battery and charge it. This time there were no battery lost. After the second charging problem persists.
If you manage to fixed it please tell us how.
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Click to collapse
No fix yet... still looking for a solution
NaxIonz said:
No fix yet... still looking for a solution
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Click to collapse
In other thread one guy says that he has the same problem and he just go to the store and they change his battery.
Rupar4o said:
In other thread one guy says that he has the same problem and he just go to the store and they change his battery.
Click to expand...
Click to collapse
Well, I doubt that I can do that since I have a Custom ROM on my tablet
Sent from my SM-P600 using XDA Premium 4 mobile app
same here
I have a similar problem with my p600. the tablet is new, got it since a month or less.
at first i was amazed of the battery life i use it a lot for work writing documents and sheets on excel, battery used to perfom quite well giving me more than 5 hours of screen on, but recently the battery starts to drop very fast, now i can barely get around 2 hours of screen on.
i've already done 2 cycles of full discharge and then charge it completely with the tablet turned off. but the problem stills.
also sometimes when i reboot the tablet the battery goes from i.e 20% to 40% after the reboot.
im still looking for a fix or solution, today i found a new official firmware for my model (4.4 firmware for telcel mexico). going to wait until the tablet is fully charged and then flash the new firmware. I dont know if its going to help but i got nothing to lose.
by the way, sending it to semsung is not an option because of knox 0x1
vashminted said:
I have a similar problem with my p600. the tablet is new, got it since a month or less.
at first i was amazed of the battery life i use it a lot for work writing documents and sheets on excel, battery used to perfom quite well giving me more than 5 hours of screen on, but recently the battery starts to drop very fast, now i can barely get around 2 hours of screen on.
i've already done 2 cycles of full discharge and then charge it completely with the tablet turned off. but the problem stills.
also sometimes when i reboot the tablet the battery goes from i.e 20% to 40% after the reboot.
im still looking for a fix or solution, today i found a new official firmware for my model (4.4 firmware for telcel mexico). going to wait until the tablet is fully charged and then flash the new firmware. I dont know if its going to help but i got nothing to lose.
by the way, sending it to semsung is not an option because of knox 0x1
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Click to collapse
sorry to revive an old thread. I have this exact issue! it's driving me bonkers! Any fixes?
brett_day said:
sorry to revive an old thread. I have this exact issue! it's driving me bonkers! Any fixes?
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Click to collapse
try this, bring life back to battery. If you use the trial version, keep exit and redo it until all cells are done.
https://play.google.com/store/apps/details?id=com.BoshBashStudios.batterydoctorrepair
buhohitr said:
try this, bring life back to battery. If you use the trial version, keep exit and redo it until all cells are done.
https://play.google.com/store/apps/details?id=com.BoshBashStudios.batterydoctorrepair
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Click to collapse
perfect thanks. I will def give this a try.
brett_day said:
perfect thanks. I will def give this a try.
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I
Well unfortunately this has not worked....battery is still tanking. last night i played plague for 30 minutes....in 30 mins battery went from 90% to 25%. I think i will try reflashing KitKat....maybe my original update was screwy. If that does not fix it then I guess I will have to call Sammy.
Man i ha e exactly the same problem. I calibrated it some months ago and it seemed to work fine. Now the problem is back.... Dont know what to do... I have tried several apps, though i read google doesn't recomend to use any app to fix the battery... we really need help here
Sent from my SM-P600 using XDA Free mobile app
---------- Post added at 08:13 AM ---------- Previous post was at 08:12 AM ----------
vashminted said:
I have a similar problem with my p600. the tablet is new, got it since a month or less.
at first i was amazed of the battery life i use it a lot for work writing documents and sheets on excel, battery used to perfom quite well giving me more than 5 hours of screen on, but recently the battery starts to drop very fast, now i can barely get around 2 hours of screen on.
i've already done 2 cycles of full discharge and then charge it completely with the tablet turned off. but the problem stills.
also sometimes when i reboot the tablet the battery goes from i.e 20% to 40% after the reboot.
im still looking for a fix or solution, today i found a new official firmware for my model (4.4 firmware for telcel mexico). going to wait until the tablet is fully charged and then flash the new firmware. I dont know if its going to help but i got nothing to lose.
by the way, sending it to semsung is not an option because of knox 0x1
Click to expand...
Click to collapse
Bumping up I have the same exact problem... any fixes?
Sent from my SM-P600 using XDA Free mobile app
Sorry to bump this, has anyone found a solution yet.
I've replaced the battery 3 times in about 9 months, but had this issue about a yr, was sent back to Samsung who changed the battery and supposedly updated the fw 4.4.2, I have since replaced the battery another 3 times every 3 months, each time either factory resetting or flashing a new rom, currently on official Smp600 5.1.1 BTU rom, today my battery was on 47%, I plugged in charger and was watching/streaming a movie on it, about 80 minutes later the tablet shut off, which was odd it's never powered off while on charge, powered it back on and battery said 19%, my previous issues has been the same as others, it can be on 100%, play a game, or stream a movie,or watch youtube etc and it will nosedive dramatically 20/30% at a time, sometimes within 10 mins it's gone from 100% to less than 30%, it's clear there's some sort of issue if others have it, I was wondering if a thread should be made to list ppl with this issue to see how many there are and go from there.
reeps said:
Sorry to bump this, has anyone found a solution yet.
I've replaced the battery 3 times in about 9 months, but had this issue about a yr, was sent back to Samsung who changed the battery and supposedly updated the fw 4.4.2, I have since replaced the battery another 3 times every 3 months, each time either factory resetting or flashing a new rom, currently on official Smp600 5.1.1 BTU rom, today my battery was on 47%, I plugged in charger and was watching/streaming a movie on it, about 80 minutes later the tablet shut off, which was odd it's never powered off while on charge, powered it back on and battery said 19%, my previous issues has been the same as others, it can be on 100%, play a game, or stream a movie,or watch youtube etc and it will nosedive dramatically 20/30% at a time, sometimes within 10 mins it's gone from 100% to less than 30%, it's clear there's some sort of issue if others have it, I was wondering if a thread should be made to list ppl with this issue to see how many there are and go from there.
Click to expand...
Click to collapse
I've been having the same issue for some time now. Calibrating the battery does help, I don't experience the problem nearly as much after calibrating it. But it'll still nosedive on occasion, maybe once a week. This is the app I use to calibrate it https://play.google.com/store/apps/details?id=com.nema.batterycalibration