Develop Bugs

Battery Drain Problem

So I bought my ATT GS3 out in Los Angeles this summer and then I returned to New Jersey to find that I have horrible battery life. It was not right away so this could be completely unrelated. As of right now my phone is at 75% and I let it drain while i was sleeping for 10.5 hours. I have tried several different roms which are usually good the first two days and then after that the battery life is bad again. I thought it may be some application I have installed so I removed a few of the ones I remembered downloading since I got back to NJ. I also updated to the latest radio ending in H9 because I was two behind when I checked. I have attached some battery information below. Any help anyone could provide would be great. I have tried Juice Defender which did save some battery life but it also caused a problem where I couldn't use the internet for 10 seconds after I wake the phone.

U need a Rom with cell standby fix
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

I thought the cell standby problem only effected the international GS3? If the cell standby fix was the problem then I shouldn't actually be draining that low right? Something must be draining the battery then. Google maps is probably draining the battery but how do I stop that from happening?

No its not just international and it is cell standby using almost 10% battery
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Diable maps only use it when needed
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JB calhoun said:
Diable maps only use it when needed
Sent from my SAMSUNG-SGH-I747 using xda premium
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Click to collapse
try Triune ii or Black jelly 0.7 i tried them both on my s3 these both hav good battery backup..

Ariel 2.10 fixes everything!

I just installed the standby fix and im going to test that and see if it helps. If that doesn't work I'll try the other roms everyone has suggested. Will take a little while to make sure whats good and whats not though. Thanks for the advice.

cloakinghalk said:
So I bought my ATT GS3 out in Los Angeles this summer and then I returned to New Jersey to find that I have horrible battery life. It was not right away so this could be completely unrelated. As of right now my phone is at 75% and I let it drain while i was sleeping for 10.5 hours. I have tried several different roms which are usually good the first two days and then after that the battery life is bad again. I thought it may be some application I have installed so I removed a few of the ones I remembered downloading since I got back to NJ. I also updated to the latest radio ending in H9 because I was two behind when I checked. I have attached some battery information below. Any help anyone could provide would be great. I have tried Juice Defender which did save some battery life but it also caused a problem where I couldn't use the internet for 10 seconds after I wake the phone.
Click to expand...
Click to collapse
Just another observation. Battery tends to drain faster if you leave it in your pocket. If you flash a rom, you might have to calibrate the battery stats. I only lose 1% every 2 hours overnight if I leave it on a cold surface.
Sent from my SAMSUNG-SGH-I747 using xda premium

So I have tried a few different roms and I'm still not happy with the battery life. I calibrate the battery after every rom installed and I usually keep that rom for atleast 2 days to test it. Right now I'm on AOKP. If the phone is on standby whats the general %/hr? When I go to sleep my phone drops from 92%-75% for about 10-11 hours (on desk at temp 60F). By Apocalypse487's response I should only see a drop of 5-6 % over night when I see 17%. Am I supposed to me losing this much battery life over night? To me I feel like I barely use my phone. Today wasn't too bad with 1 hr with screen on and about 1 hr in calls. I made it about 1 day 1 hour 36min on battery. My phone was sleeping for about 23.5 hours. Is this the typical battery life or is something wrong with mine? Tonight I'm going to try juicedefender and see if that helps.

cloakinghalk said:
So I have tried a few different roms and I'm still not happy with the battery life. I calibrate the battery after every rom installed and I usually keep that rom for atleast 2 days to test it. Right now I'm on AOKP. If the phone is on standby whats the general %/hr? When I go to sleep my phone drops from 92%-75% for about 10-11 hours (on desk at temp 60F). By Apocalypse487's response I should only see a drop of 5-6 % over night when I see 17%. Am I supposed to me losing this much battery life over night? To me I feel like I barely use my phone. Today wasn't too bad with 1 hr with screen on and about 1 hr in calls. I made it about 1 day 1 hour 36min on battery. My phone was sleeping for about 23.5 hours. Is this the typical battery life or is something wrong with mine? Tonight I'm going to try juicedefender and see if that helps.
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Click to collapse
I'm using ParanoidAndroid based off of CM10. Version 2.16 of PA gave me the best battery life. Try that. Certain Roms have better battery management, but that probably depends on the kernel. PA uses stock.
Sent from my SAMSUNG-SGH-I747 using xda premium

I'll give ParanoidAndroid a try and see what that does. So Juicedefender ended up making it so I only lost 1% over 9 hours. Thats pretty good. Way better than I wanted. So what could be draining the power over night. Is it because my data is on all the time but shut off when using Juicedefender?

I use Trinue 2, and I use an app called Go Power Master.
In GPM you can setup options that will turn off mobile data/gps/wifi when the screen is turned off, will automatically turn them back on when the screen is back on.
Those things little things I find can make a big difference for the battery to last throughout the day.

Sianspheric said:
I use Trinue 2, and I use an app called Go Power Master.
In GPM you can setup options that will turn off mobile data/gps/wifi when the screen is turned off, will automatically turn them back on when the screen is back on.
Those things little things I find can make a big difference for the battery to last throughout the day.
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cloakinghalk said:
I'll give ParanoidAndroid a try and see what that does. So Juicedefender ended up making it so I only lost 1% over 9 hours. Thats pretty good. Way better than I wanted. So what could be draining the power over night. Is it because my data is on all the time but shut off when using Juicedefender?
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Click to collapse
It's as Sianspheric says, common things like gps, data, and wifi uses power. I just started using Juicedefender since my friend told me it helps. Also download battery calibration. It's a root only app. Don't let your device discharge completely. It's bad for Lithium Ion batteries. That will clear out any bad data from Samsung.
Sent from my SAMSUNG-SGH-I747 using xda premium

How can I fix this?

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?
Click to expand...
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.
Click to expand...
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

FK23 rapid battery drain

First off I want to say I'm not a noob when it comes to flashing. I usually get 14-18 hours on a full charge with 3-4 hours screen time which seems to be the norm on e4gt roms. I haven't reinstalled any apps since flashing the FK23 stock leak and now a few days into the room settling I have almost 4 hours on a full charge and down to 9 percent left with almost 2 hours screen time. I have checked to see if my battery is swollen and it's not. The battery stops spinning immediately after I let go of it. Screen shots are attached and any insight would definitely be appreciated. I may have to go back to blu kuban since that's been giving me equivalent if not better batter life compared to FK23 stock
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Update lost 7 percent in 20 minutes on lowest brightness level
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kbrann85 said:
Update lost 7 percent in 20 minutes on lowest brightness level
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Did you use One click odin to flash this?
Try removing unneeded stock apps

No this is from the tar file flashed in Odin 1.85 I believe... Had no issues for a few days now it's going crazy...I didn't even restore my internal and external sd backups yet as I wanted to test a clean install first
Sent from my SPH-D710 using xda premium

I'm having rapid battery drain, too. I used the one-click no-data. I want to wipe everything and start over. Can I simply download and OC the data, or do I need to do something else, first?

As far as I know (devs correct me if I'm wrong) you can just use the OC restore that doesn't say no data... But I went the extra step and copied my entire internal and external to my pc for safe measures and so I could pick and choose what I wanted back on my phone. Then I cleared my internal and external sd before I even one clicked so it was already clean... I just wanted to make 100 percent sure everything was clean but that's just me
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Im not having any issues. Let your phone go dead tonight and charge it completely to 100% while off. Do not interrupt it until complete. Since I started doing this on flashed roms I have been getting better battery performance.
This is Dan's rooted deodexed zip...
Sent from my SPH-D710 using xda app-developers app

byrdcfmma said:
Im not having any issues. Let your phone go dead tonight and charge it completely to 100% while off. Do not interrupt it until complete. Since I started doing this on flashed roms I have been getting better battery performance.
Sent from my SPH-D710 using xda app-developers app
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I just did this while taking a nap and this is what I have so far after 100 percent charge and I restarted once to pull battery and look at it
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kbrann85 said:
I just did this while taking a nap and this is what I have so far after 100 percent charge and I restarted once to pull battery and look at it
Sent from my SPH-D710 using xda premium
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Was it completely dead when you put it on charge? I don't know why this works for me, but every Rom I have ever flashed, unless something is wrong with it, gives me better battery life 3-5 days after I flash it. Some of the old-timers say a Rom has to settle for a few days, so maybe it helps do that quicker. If all else fails, reflash the Rom.

kbrann85 said:
I just did this while taking a nap and this is what I have so far after 100 percent charge and I restarted once to pull battery and look at it
Sent from my SPH-D710 using xda premium
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I gotta say that your drain seems pretty extreme! I myself am having slightly accelerated battery drain but its better than what I had on ICS. My best recommendation would be to use an app like ROM Toolbox or Titanium Backup to freeze apps and background processes you don't need. If that doesn't help you may need to look at other options.

rwilco12 said:
I gotta say that your drain seems pretty extreme! I myself am having slightly accelerated battery drain but its better than what I had on ICS. My best recommendation would be to use an app like ROM Toolbox or Titanium Backup to freeze apps and background processes you don't need. If that doesn't help you may need to look at other options.
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^Thanked
I'm going to try installing GSAM and checking out what's going on in the background but as far as I can see nothing out of the ordinary is going on with the processes. On a side note when I took a look at my battery itself the sticker has pink X's on it. Not so sure if it's water damage per say but it may be condensation/humidity since I live in Florida. Looking into getting an extended battery as a replacement and any suggestions on the cheapest but most reliable battery to purchase would be helpful and I don't really mind if I have to have a larger back door on my phone. The cheapest I've found is a Trexcell with the back door for $16.99 free shipping. If anyone knows of anything better/cheaper please point me in the right direction.
Another issue I've been having is wifi will connect and reconnect uncontrollably whenever it feels like it, and the sprint connection optimizer was disabled since I Odin'd.

kbrann85 said:
^Thanked
I'm going to try installing GSAM and checking out what's going on in the background but as far as I can see nothing out of the ordinary is going on with the processes. On a side note when I took a look at my battery itself the sticker has pink X's on it. Not so sure if it's water damage per say but it may be condensation/humidity since I live in Florida. Looking into getting an extended battery as a replacement and any suggestions on the cheapest but most reliable battery to purchase would be helpful and I don't really mind if I have to have a larger back door on my phone. The cheapest I've found is a Trexcell with the back door for $16.99 free shipping. If anyone knows of anything better/cheaper please point me in the right direction.
Another issue I've been having is wifi will connect and reconnect uncontrollably whenever it feels like it, and the sprint connection optimizer was disabled since I Odin'd.
Click to expand...
Click to collapse
Ya GSAM is a must have. I run it on every one of my devices. I was also getting some irregular battery drain. Then I looked at what apps where keeping my device awake the most and found that hotmail app had a 4 hour wake lock! Ouch! I uninstalled that and setup the default email client to check my hotmail hoping this will resolve my issue. But I can tell you right now nothing else is keeping my device awake that long so in theory this should solve my issue. You may want to go through this same exercise. After a couple of hours of running GSAM looking at which apps are using the most power. Then switch your view to "Time help awake" and see if something has a wake lock holding your device awake.
Good luck

I re-read garwynn's instructions for the one-click and realize that I made a mistake going from ICS (Lightweight) to FK23 without a full wipe. I thought I was paying closer attention when flashing, but I screwed up. Thankfully, this should be easily fixable. I'm running the one-click restore and am optimistic things will be better.

cas8180 said:
Ya GSAM is a must have. I run it on every one of my devices. I was also getting some irregular battery drain. Then I looked at what apps where keeping my device awake the most and found that hotmail app had a 4 hour wake lock! Ouch! I uninstalled that and setup the default email client to check my hotmail hoping this will resolve my issue. But I can tell you right now nothing else is keeping my device awake that long so in theory this should solve my issue. You may want to go through this same exercise. After a couple of hours of running GSAM looking at which apps are using the most power. Then switch your view to "Time help awake" and see if something has a wake lock holding your device awake.
Good luck
Click to expand...
Click to collapse
Well after installing gsam I was able to see that after going from 77% to 15% in just over 4 hours with 1 hour screen time I noticed that media server had 293 wakelocks with 1 hour of time held awake...might have found the culprit...will keep you guys updated as im sure it will help a few...just wanted to update that I switched to Universe JB to see if it was just that tar...apparently it wasn't seeing just as much battery drain
Sent from my SPH-D710 using xda premium

And now I also figured out that the media server was not the only culprit. The battery seems to be the problem after numerous tests returning results that the battery was only a 1175 mah battery instead of what it should be 1800 mah. The battery does not spin so don't always judge by that test alone. After deciding to put my OG Epic 4G slider battery in and take it for a spin these are the results I have so far with 300 mah less (1500 total) here is the screen shots below from a full charge
*EDIT * I'm now running blu Kuban FI27 and tested also with the stock 1800mah battery still dies rapidly and WiFi still disconnects and reconnects randomly
Sent from my SPH-D710 using xda premium

Averaging 10% loss every hour
I am experiencing roughly 8-12%, so averaging around 10% loss every hour with moderate to slightly heavy use. Right now after 5 hours & 10 minutes i am at 50%. I have Facebook & an Exchange email synced and was on a phone call for over an hour, have been texting a bit and using email, the internet & Facebook. I have removed Sprint ID, which seems to run in the background along with Sprint radio, Nascar, Yahoo Stocks & News, so that may be helping a little. Overall I think that the battery performance has improved for me.

I was experiencing some pretty bad drain but after letting the kernel settle for a few days and disabling the location services, I can easily make it through the day

My batter time stinks!
I'm also getting 9% per hour battery drain. I have a Tasker profile running which turns off DATA when the screen is off. Most of the day, my phone has not been in use and I'm still getting battery drain. BetterBatteryStats shows that a process called "surfaceflinger" (Android System) has used the most followed by "googlequicksearchbox" followed by Gmail. Partial Wakelocks report says "signalCollector.Scanner has a count of 4844 and "LocationRecieverService" has a count of 3411 with "LocationReportingService" having a count of 5625. However, all of these combined only add up to 2% so I'm confused as to what is burning my battery.

nspeer said:
I'm also getting 9% per hour battery drain. I have a Tasker profile running which turns off DATA when the screen is off. Most of the day, my phone has not been in use and I'm still getting battery drain. BetterBatteryStats shows that a process called "surfaceflinger" (Android System) has used the most followed by "googlequicksearchbox" followed by Gmail. Partial Wakelocks report says "signalCollector.Scanner has a count of 4844 and "LocationRecieverService" has a count of 3411 with "LocationReportingService" having a count of 5625. However, all of these combined only add up to 2% so I'm confused as to what is burning my battery.
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Have u checked to make sure your battery isn't going bad? Take it out and try spinning it on a table on both sides if it spins like a top its starting to bulge, bulging battery = bad battery
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Just did spin test as suggested. The battery did indeed spin like a top on both sides. Just ordered a replacement. Has anyone tried one of the "Gold" 2430mAh batteries made in Japan and being sold on Ebay from China?

[Q] [q] Is this what a dying battery looks like?

I noticed when I was looking at battery stats (trying to figure out what's eating the battery; very little in the way of apps installed)
I bought the phone last week, but I bought it used on eBay. It came with the original box and the manufacture date is 6/30/12, so I figure this was someone's everyday device for 10 months.
The reason I ask is that sudden dip from 20 to 30%. And the other reason I ask is that I only get about 10 hours with 3 hours of screen-on time on a full charge. If the battery is just losing capacity, that's fine - I'll get a ZeroLemon 2300maH battery and I should get much better life. If the battery still has close to full capacity, then I'll get an extended-capacity battery. I just need some guidance as to whether or not it's crapping out so I have a better idea of what to buy.
Thanks!

Jump is weird. Could be the battery is flaky. But I would make effort to reseat it. I want to see what BetterBatteryStats says about that terrible wakelocking, though.
You can delete batterystats.bin from /data/system. Everyone says it does nothing. But I do it anyway. Because I can.

My stock battery usually gives me 7-8hrs of standby and 3hrs of screen time.
Zerolemon 2300mah gives me 20hrs of standby and usually 5hrs of screen time.
You can check in the accessories section in the zerolemon 2300mah that I've posted some of my results via screenshots.
About the dip, I'm not sure I've never noticed that on any of my batteries.
Sent from my SGH-T999 using xda app-developers app

Jump has been there consistently. Had the phone 4 days, and every day when it hits 30% it drops to 20%.
Installed Betterbatterystats and I'll see what's keeping it awake. It does seem to be awake an awful lot compared to my old Atrix (switched to T-Mobile a month or so ago, and just got the phone after I was switched for a bit), which got way better battery life.

10 hours with 3 hours of on screen time is just about average for the stock battery.
I would recommended getting the zero lemon 2300 mAh slim batteries if you're lucky enough to place an order for them. They only restock in small amounts and they disappear quick.
Sent from my SGH-T999 using xda premium

707BeastMode707 said:
10 hours with 3 hours of on screen time is just about average for the stock battery.
I would recommended getting the zero lemon 2300 mAh slim batteries if you're lucky enough to place an order for them. They only restock in small amounts and they disappear quick.
Sent from my SGH-T999 using xda premium
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Well that's good to know. They're in stock right now on Amazon so I'll pick up the 2-pack with the charger.

OK so far the phone has spent half its time unplugged staying awake, and about half of that is being caused by DeskSMS. I got a trial a long time back and decided not to bother because I didn't use it, and when my google account restored to the phone, it apparently got installed and I didn't notice. I've uninstalled that and we'll see what else happens. Very thankful for the BetterBatteryStats suggestion; I'd never heard of it.

Well the battery is lithium ion. With repeated charging the battery loses capacity. If the battery is the one that came with the phone, buy a new stock one for cheap off Amazon. That is if you use NFC and have a certain fitted case. If not, go for an extended battery by reviews on Amazon and XDA. My battery is from December and I haven't noticed any decrease yet. The temperature of which your phone runs and the temperature of the environment also effect battery life.
Sent from my SGH-T999 running Chihuahua v1 ROM

Great news, everyone. Desk Sms was the culprit all along. This is 3 hours of Netflix and then sleep over night. Just a couple wake locks that I can attribute to emails received overnight.
So out turns out the battery other than the weird drop, at least with the power saver on.
Thanks in particular for the Better Battery Stats suggestion. Without it I would have been majorly confused.
Sent from my SGH-T999 using xda premium

DeerSteak said:
Great news, everyone. Desk Sms was the culprit all along. This is 3 hours of Netflix and then sleep over night. Just a couple wake locks that I can attribute to emails received overnight.
So out turns out the battery other than the weird drop, at least with the power saver on.
Thanks in particular for the Better Battery Stats suggestion. Without it I would have been majorly confused.
Sent from my SGH-T999 using xda premium
Click to expand...
Click to collapse
Glad you were able to get it all figured out. Wakelocks are VERY annoying. Search for kms.apk if Mediaserver is ever draining your battery in the future, it is a common battery draining problem as well.
If you're on TouchWiz using Power Saver, I'd recommend disabling it. It throttles your CPU in half. This may cause instability, or overheating problems or sometimes even battery drain ironically. I do however recommend, KT747 kernel with changing govs, and I/O scheduler and using Team Kernelizer tweaks. Try Eugene's CPUSleeper and it may help put DeskSMS to sleep for good. And how could I forget? Definitely try Greenify. It makes apps behave akin to iOS devices. Best of luck.

TheLastSidekick said:
Glad you were able to get it all figured out. Wakelocks are VERY annoying. Search for kms.apk if Mediaserver is ever draining your battery in the future, it is a common battery draining problem as well.
If you're on TouchWiz using Power Saver, I'd recommend disabling it. It throttles your CPU in half. This may cause instability, or overheating problems or sometimes even battery drain ironically. I do however recommend, KT747 kernel with changing govs, and I/O scheduler and using Team Kernelizer tweaks. Try Eugene's CPUSleeper and it may help put DeskSMS to sleep for good. And how could I forget? Definitely try Greenify. It makes apps behave akin to iOS devices. Best of luck.
Click to expand...
Click to collapse
The problem with Greenify, in this case, is you can't hibernate apps that send notifications, or you will never get them.

The power saver doesn't bother me. Being in the notification area makes it easy to toggle and performance has been fine. Better Battery Stats says it gets up to 1 GHz Mac and that is plenty on the web or Facebook or Netflix.
I had assumed the media server popping up was due to Netflix streaming. It hasn't been back today since recharging. If it comes back I'll look more at disabling. Today battery life has been great. 12 hours with 2 hours of on time and at 45 percent. I definitely over reacted to the drop and it must have been Desk SMS which never should have been installed.
Sent from my SGH-T999 using xda premium

If anyone has any issue with their battery sprint corp stores have a tester takes about ten min. They won't have a problem doing it if you're nice, sprint or not. It will either end up excellent marginal or poor... they don't charge for the test.
tmobile s3 running wicked. best rom i've ever used

Randomly battery life dropped

Hey guys. So unfortunately better battery stats stopped functioning. Basically when I first got the phone the battery life was pretty good, close to 5 hours screen on time, decent standby battery life. Recently within an hour of screen on and phone off the charger for about 3 hours it could easily be at 50pct. I am currently running wicked version 6 with stock kernel. I haven't downloaded any new apps that have exacerbated it and seems to deliver about the same battery life on a clean install of a rom before restoring all of my apps.
Anyone else experience this? I've tried both my stock battery and another battery with the same results.
Auto sync off as always. No clue why the crazy drop in battery performance and light on the subject would be awesome.
Sent from my SGH-M919 using xda premium

Bump thx
Sent from my SGH-M919 using xda premium

This erases batterystats.bin

Thanks this seemed to help slightly, but still having significant battery drain
Sent from my SGH-M919 using xda premium

lorddart said:
Thanks this seemed to help slightly, but still having significant battery drain
Sent from my SGH-M919 using xda premium
Click to expand...
Click to collapse
It's in your mind. Wiping the battery stats did absolutely nothing for you. Guarenteed.
You could have a battery that went bad. Take it out of hte phone and look at it. Is it bulging anywhere on the surface on either side?
If so the battery is bad. Replace it.
If not, it coudl still be a bad battery. See if you can find someone else with an S4 who will let you test their battery for a few hours.
Also, try a full wipe and reinstall of the rom. And restore your apps in small groups over several hours. See if battery life suddenly suffers after installing a particular app.
You could could have a messed up setting in the ROM, a rouge app that isnt' showing up on BBS, a bad battery, etc etc etc.

Try cpu sleeper? Quad core version
Sent from my SGH-M919 using Tapatalk

I noticed a pretty significant reduction in battery life since I bought the device. I see people getting 5-7 hours of screen-on time; 4-5 days idle time, etc... I could easily do that when I first got it but after around 2 months, I'm lucky to have 2 hours screen on; I'll drop about 10% over an 8 hour period on idle... I've tried on fresh installs of both TW and AOSP; adding none of my own apps and the results are the same. Stock kernel, Ktoonsez kernel, various settings, etc... I've also noticed that sometimes, say the status bar will tell me I've got 92% battery left; I boot into recovery and TWRP tells me I've got 97% left. That, to me, sounds like the battery is going south so I'll be trying a new battery here soon.

Thanks for the suggestions guys, I've got a spare battery been the same experience and similar to cheetoh, I've done fresh installs, no apps and standard kernel with same results. I'll maybe pick up a zerolemon and see if that plus a fresh start helps because this is ridiculous. My battery life used to be amazing I loved it, best phone to date for me, 5+ hours screen on and would spend the day outta the house, come home late night and still have 30pct. Now, it's at 30pct by 1pm... No difference in how I use it, if anything I use it less now. I'll try these things again and probably pick up a zerolemon... Usually this isn't a problem but I'm going to have to be spending a few long days without access to a charger during the day, and don't wanna get screwed. Anyway thanks guys.
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If nothing helps get a Zero Lemon 7500
Battery.
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lorddart said:
Thanks for the suggestions guys, I've got a spare battery been the same experience and similar to cheetoh, I've done fresh installs, no apps and standard kernel with same results. I'll maybe pick up a zerolemon and see if that plus a fresh start helps because this is ridiculous. My battery life used to be amazing I loved it, best phone to date for me, 5+ hours screen on and would spend the day outta the house, come home late night and still have 30pct. Now, it's at 30pct by 1pm... No difference in how I use it, if anything I use it less now. I'll try these things again and probably pick up a zerolemon... Usually this isn't a problem but I'm going to have to be spending a few long days without access to a charger during the day, and don't wanna get screwed. Anyway thanks guys.
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So this still happens even with a different battery?