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[Q] Battery Drain issue, please help

Hello,
I'm currently experiencing an unexplained battery drainage issue and need some ideas from you all! I used to get a battery drain from the phone while it was asleep and connected to my wifi of -10 to -14Ma, where as I now get -76Ma! I'm using "Current Widget" from the market to monitor battery usage which is logged to a file. I have no idea where the additional % is coming from and after exhaustive testing over the last day I'm beginning to go out of my mind here... The phone is consuming too much battery while idle and therefore running flat far too quickly.
I can't quite determine when this started to happen. I'm running LBC v0.5.4 and have been for ages, I upgraded to the latest radio 06.02.03_M although I've tried reverting radios to most of the older ones and can't seem to loose the problem. I've completely reset the device, using the WIPE script (format commands) and installed fresh LBC v0.5.3 and v0.5.4, after the initial install I get the minimal drain (-10Ma) to start with but after the first device reboot its back up -76Ma, this happens both with & without a google accounts configured.
I have no additional applications installed from the market and am installing only current widget from its apk. AUTO-SYNC is off. I've even tried multiple full resets, re-flashes of the ROM, differing kernels, multiple Radios and setup using a different google account (my wifes) and the same thing STILL happens.
It can't be the router related as my wife phone a brand new DESIRE S (still running STOCK) is getting -16Ma from the same router, which I have rebooted. It can't be current widget as I'm running the same apk that my wife is and she isn't getting the problem, plus I've run it for months now and not seen this drain!
I'm considering going back to STOCK! which can't be good. Please help....any ideas and/or suggestions welcome.....(except use my wifes phone!) I must be missing something?
If you can't think of anything that I'm missing, could you at least state the ROM & RADIO version that you're using and the battery consumption that you get in a similar state.

have you tried deleting the file battery_history.txt on your SD card?

kartkk said:
have you tried deleting the file battery_history.txt on your SD card?
Click to expand...
Click to collapse
I only have a currentwidget.log file on the SD card that's produced by the Current Widget application and I've tried removing that a couple of times with no effect.
What produces battery_history.txt? isn't that another battery consumption application?

It's the Battery Monitor Widget. Try that and report the results.

ben_pyett said:
I only have a currentwidget.log file on the SD card that's produced by the Current Widget application and I've tried removing that a couple of times with no effect.
What produces battery_history.txt? isn't that another battery consumption application?
Click to expand...
Click to collapse
Opps I thought you were refering to battery monitor widget
Try battery monitor widget like shrome suggested
Other than the reading how is the battery life doing,it is possible that the reported reading is incorrect ,if the reading is right your device should be out of battery very fast

kartkk said:
Opps I thought you were refering to battery monitor widget Try battery monitor widget like shrome suggested
Other than the reading how is the battery life doing,it is possible that the reported reading is incorrect ,if the reading is right your device should be out of battery very fast
Click to expand...
Click to collapse
No problem...
The battery life unfortunately does seem to be reduced. I have always had that widget on my main home screen so notice its reading whenever I'm operating the device for months now and its normally accurate which is why I spotted the change.
Although I'll be honest since I spotted the change in the reading I've been constantly flashing, wiping, restoring etc which are all heavy operations on the battery life so its really difficult to tell.
Next time the battery hits 100% charged I'll also re-calibrate.
EDIT: Have wiped battery stats from recovery
EDIT2: Have switched and am now testing with battery monitor widget, will report back

ben_pyett said:
No problem...
The battery life unfortunately does seem to be reduced. I have always had that widget on my main home screen so notice its reading whenever I'm operating the device for months now and its normally accurate which is why I spotted the change.
Although I'll be honest since I spotted the change in the reading I've been constantly flashing, wiping, restoring etc which are all heavy operations on the battery life so its really difficult to tell.
Next time the battery hits 100% charged I'll also re-calibrate.
EDIT: Have wiped battery stats from recovery
EDIT2: Have switched and am now testing with battery monitor widget, will report back
Click to expand...
Click to collapse
Is your device getting heated ?
Have you tried switching battery & the sim card with the other DS you have?

ben_pyett said:
EDIT: Have wiped battery stats from recovery
EDIT2: Have switched and am now testing with battery monitor widget, will report back
Click to expand...
Click to collapse
Have again fully wiped, reset and re-flashed LBC v0.5.3. I configured no accounts and turned off auto sync. Flashed v0.5.4 update and am running with the latest RADIO (20.28I.30.085AU_3805.06.02.03)
No applications installed except Battery Monitor Widget. No screens contain any widgets apart from the clock.
My device is clocking battery consumption figures of -36mA to 100mA...
Yet my wife's new (STOCK 1.30)) with 03.02.11 radio is clocking just -7mA!

kartkk said:
Is your device getting heated ?
Have you tried switching battery & the sim card with the other DS you have?
Click to expand...
Click to collapse
My device isn't particularly warm.
Although good call on swapping Battery and SIM I'm doing that now, just one at a time in the hope that it is one of these then I'm able to identify which one
EDIT: rather than change too many things at once I'll also try a different SD card in mine after these initial tests.

ben_pyett said:
Have again fully wiped, reset and re-flashed LBC v0.5.3. I configured no accounts and turned off auto sync. Flashed v0.5.4 update and am running with the latest RADIO (20.28I.30.085AU_3805.06.02.03)
No applications installed except Battery Monitor Widget. No screens contain any widgets apart from the clock.
My device is clocking battery consumption figures of -36mA to 100mA...
Yet my wife's new (STOCK 1.30)) with 03.02.11 radio is clocking just -7mA!
Click to expand...
Click to collapse
OK, this is downright weird. The issue is probably in the kernel, not Radio. Try switching kernels, go to Unity V2.
EDIT: This may be a hardware issue. I think i read your wife has a desire s. Try switching batteries.

shrome99 said:
OK, this is downright weird. The issue is probably in the kernel, not Radio. Try switching kernels, go to Unity V2.
Click to expand...
Click to collapse
LBC mod 5.4 comes with unity v2 kernel as default
& also it can't be a software problem as he has been using the device with the same setup before without a problem

kartkk said:
LBC mod 5.4 comes with unity v2 kernel as default
& also it can't be a software problem as he has been using the device with the same setup before without a problem
Click to expand...
Click to collapse
Correct, I tried switching kernels back to stock earlier and saw no difference.
Swapped SIMs and saw no noticeable difference the new device was still clocking incredibly low numbers.....<10mA whereas mine (with her SIM) still clocked ~50mA
Swapping batteries now.

what's the reading on your wift's battery?

If all else fails, try switching ROMs altogether. Go to virtuous unity. Aosp roms have battery drain, so you won't have any luck on those. Maybe an upcoming update of lbc mod fixes this issue.

mind trying and tell us your reading?my friend who's on hd2 android has reading around 1-4 mA..

tcchuin said:
mind trying and tell us your reading?my friend who's on hd2 android has reading around 1-4 mA..
Click to expand...
Click to collapse
1-4 mAH ?!?!?!?! This is freakin impossible on desire s. 7-10 is normal. I think he posted in the first post.
Edit: ok, this is a shot in the dark. My friend on Virtuous ha similar readings, so i was following this closely. Turns out, he was checking the widget rather than the file in te sdcard (battery_history.txt) the file shows the stats for when the phone is asleep. Check carefully. The widget will usually show 70-100 mAh, as while checking the widget, the phone is awake.

tcchuin said:
what's the reading on your wift's battery?
Click to expand...
Click to collapse
Was still testing, as I need to collect a few continuous minutes of screen off testing to make it fair.
Although as you mention in the LBC thread. which hopefully shows that this can't be a hardware issue with my device, unless it's from the w-ifi attena itself?
If I swicth off the wi-fi completely on both devices, which I've just done then the drain disappears from my device and it starts clocking ~13mA, although hers is still consistently putting in 7mA.
Now time to try a new SD card in mine, must try that before reverting to stock ROM.

shrome99 said:
1-4 mAH ?!?!?!?! This is freakin impossible on desire s. 7-10 is normal. I think he posted in the first post.
Click to expand...
Click to collapse
Easy....he said his friend with a HD2, its a known fact that there is a battery drain issue on the DS as if you were to compare its drain to that on the old Desire its over twice the idle.
There are plenty of threads early on covering this issue....although none of them ever identified any reason. Its interesting to see what the CM7 ROM can achieve in this respect.

Newer processor = more battery consumption

shrome99 said:
Edit: ok, this is a shot in the dark. My friend on Virtuous ha similar readings, so i was following this closely. Turns out, he was checking the widget rather than the file in te sdcard (battery_history.txt) the file shows the stats for when the phone is asleep. Check carefully. The widget will usually show 70-100 mAh, as while checking the widget, the phone is awake.
Click to expand...
Click to collapse
Fair call....but unfortunately I'm checking both but only rely on the results from the file.

Battery Dies Quick, WHY??

my NS4G with MIUI 2.6.1 and Matrix 20.0 Kernal goes to 98% as soon as i pull off the charger. if i use it for 45 minutes unplugged its dead. if i use it while its plugged in, it will die!
should i get a new battery?

Yeah that doesn't happen to me... I would try a full wipe and reflash the same ROM (or a different one) and reflash kernel.
If that doesn't work then I would try another battery because that drain seems abnormal

I just wanted to say that I have been having similar battery problems. Using the exact same ROM and Kernel as the OP, today my phone died within 6 hours of use, with the screen having been on for no more than 50 minutes. I also turned off data, and sync during this time, and had my screen's brightness at the minimum.
I've wiped and flashed AOKP b-38 today, and the consumption seems to be much better.
Any thing to help?

thought i was the only one.
is it the kernal?
or is it because its time for a new battery?
How could I test to find out which it is...

Swap kernels. Probably easiest way to test.
Very possible its just an old worn out battery.
Sent by pocket technology.

hoping its just an old battery.
ive switched to CM9 / TouchWiz mod thinking it might be the ROM
im going to use the stock kernal from CM9 for a day to see if i could tell a difference.
ordered a new battery anyways.
saw on a forum somewhere a guy complaining about this problem since he switched to ICS ROMs .. hopefully thats not the case because i LOVE 4.0.X

mathkid95 said:
Yeah that doesn't happen to me... I would try a full wipe and reflash the same ROM (or a different one) and reflash kernel.
If that doesn't work then I would try another battery because that drain seems abnormal
Click to expand...
Click to collapse
same problem, switched from MIUI to CM9 ... still using Matrix 20.0

Try wiping battery stats
Sent from my Nexus S using xda premium

If it were processes/functionality causing your battery drain, that quick, the phone would be piping hot at the same time!

superng888 said:
Try wiping battery stats
Sent from my Nexus S using xda premium
Click to expand...
Click to collapse
No. Why would that have any effect on anything?
Sent by pocket technology.

JiminyCricket64 said:
If it were processes/functionality causing your battery drain, that quick, the phone would be piping hot at the same time!
Click to expand...
Click to collapse
yes, the screen also gets EXTREMELY hot!

Well in that case, what have you got installed? If you have apps constantly syncing, that could be part of the problem. What are your battery stats saying is using the most battery? My phone gets warm, but as expected since its being used. If its not being used,it could be a rogue app or the phone could be constantly searching for a good signal.
Sent by pocket technology.

i have barely any apps.
i only have facebook, xda, sportscenter and instagram installed besides GApps.
i have the problem even before i download apps as i just flashed CM9
also its so bad, that if i start using my battery when its @ 10% PLUGGED IN, it will eventually die on me. even though its charging..

[Q] battery drains /w heat in idle

Battery drains 100 to 0 in 2~3 hours.
It occurs even sitting in idle and my spare battery shows the same problem.
I've flashed cm7, cm9, and stock roms but the problem still persists.
I have no idea whether it is a hardware issue, or RIL&baseband related.
switched off GPS, wifi, and auto-sync, lowered backscreen light to 25%
downclocked cpu to 245
battery calibration
battery saving apps
fix50
factory reset
Nothing could solve the problem... any help?

yoricome said:
Battery drains 100 to 0 in 2~3 hours.
It occurs even sitting in idle and my spare battery shows the same problem.
I've flashed cm7, cm9, and stock roms but the problem still persists.
I have no idea whether it is a hardware issue, or RIL&baseband related.
switched off GPS, wifi, and auto-sync, lowered backscreen light to 25%
downclocked cpu to 245
battery calibration
battery saving apps
fix50
factory reset
Nothing could solve the problem... any help?
Click to expand...
Click to collapse
So your saying that even with a fresh install (no apps installed) you're having the same problem? The android system seems to be consuming a lot of battery, normally its around 2 to 3%. Do you have an SD card? have you tried scanning it for viruses? Or may be you could try installing an antivirus just to be sure and put your device and sd through a full scan.

waqaszahid said:
So your saying that even with a fresh install (no apps installed) you're having the same problem? The android system seems to be consuming a lot of battery, normally its around 2 to 3%. Do you have an SD card? have you tried scanning it for viruses? Or may be you could try installing an antivirus just to be sure and put your device and sd through a full scan.
Click to expand...
Click to collapse
thanks for reply. havn't thought about virus. now i'm trying full scan. hope this work.

After all these following tests, the problem still persists and now I think it is related to mechanical issue..
I will try to contact HTC reps.. Thanks for your advice anyway.

I have the same problem
yoricome said:
Battery drains 100 to 0 in 2~3 hours.
It occurs even sitting in idle and my spare battery shows the same problem.
I've flashed cm7, cm9, and stock roms but the problem still persists.
I have no idea whether it is a hardware issue, or RIL&baseband related.
switched off GPS, wifi, and auto-sync, lowered backscreen light to 25%
downclocked cpu to 245
battery calibration
battery saving apps
fix50
factory reset
Nothing could solve the problem... any help?
Click to expand...
Click to collapse
android system on my htc chacha is using something like 48%, I charge my phone three times a day, was ur problem related to a virus or something? I try not to buy a antivirus since it costs too much and also I believe it drains much more battery than android system..

yoricome said:
After all these following tests, the problem still persists and now I think it is related to mechanical issue..
I will try to contact HTC reps.. Thanks for your advice anyway.
Click to expand...
Click to collapse
I doubt whether a hardware problem could be the cause, android system should not consume so much battery in any case. Did you wipe all data, cache and dalvik cache when you installed the custom roms?

I didn't install a custom rom, the only thing that I did was S-off and rooting the phone, could it have caused this issue?
Sent from my HTC ChaCha A810e using Tapatalk 2

yoricome said:
Battery drains 100 to 0 in 2~3 hours.
It occurs even sitting in idle and my spare battery shows the same problem.
I've flashed cm7, cm9, and stock roms but the problem still persists.
I have no idea whether it is a hardware issue, or RIL&baseband related.
switched off GPS, wifi, and auto-sync, lowered backscreen light to 25%
downclocked cpu to 245
battery calibration
battery saving apps
fix50
factory reset
Nothing could solve the problem... any help?
Click to expand...
Click to collapse
You said in your first post that you have flashed cm7 and cm9 and I am guessing you must have done it using clockwork recovery. I am a little confused now. Did you factory reset the device?

waqaszahid said:
You said in your first post that you have flashed cm7 and cm9 and I am guessing you must have done it using clockwork recovery. I am a little confused now. Did you factory reset the device?
Click to expand...
Click to collapse
I did factory reset more than ten times.
Actually, this battery issue has started to happen since I flashed cm9. At first, I thought this came from mismatched RIL & baseband.
(Note : http://forum.xda-developers.com/showthread.php?t=1549488)
Sadly GetRIL doesn't support chacha, so I just flashed back to the one I used before - with full wipe - but it couldn't resolve the issue.
The last thing I could think of was flashing back to stock rom and I followed this guide.
(Note : http://androidforums.com/chacha-all...lash-back-stock-rom-chacha-please-sticky.html)

I agree that it is strange Android System process eats too much of battery, but I couldn't find any errors from it when I checked the process log.

Are you sure there is nothing wrong with your actually battery? try getting a replacement and see if that helps.

To me android system consumes the same amount and I have like 5 hours full use(e.g. browsing + 3G) , I believe there might be a problem with ur own battery, try replacing it and see whether it works for u or not
Sent from my HTC ChaCha A810e using Tapatalk 2

atrix4g18 said:
Are you sure there is nothing wrong with your actually battery? try getting a replacement and see if that helps.
Click to expand...
Click to collapse
pakdaman said:
To me android system consumes the same amount and I have like 5 hours full use(e.g. browsing + 3G) , I believe there might be a problem with ur own battery, try replacing it and see whether it works for u or not
Sent from my HTC ChaCha A810e using Tapatalk 2
Click to expand...
Click to collapse
I have two brand new batteries and both of them have the same issue.
Today one of HTC tech reps told me they checked my cell and found a problem with mainboard. They will replace it.
I will close this thread. Thank all of you guys for supporting.

[SOLVED] [Q] Starting from scratch

I'm having issues of the phone rebooting by itself and consequently draining ~90% of the battery when it does so. I've tried flashing a bunch of different ROMS to see if I can stop it from happening, but to no avail. I'd like to go completely from scratch and hopefully I can get to a point where the phone works for an entire day without crashing. I've been using the HD2 instead of the SGS4G for a couple months now, so I'm a bit rusty, which is why I came here to ask for suggestions. This is what I was planning on doing:
- Flash one of these stock ROMs in order to get back to where I started.
- Format my SD card completely and let the phone convert it back to EXT4
- And then flash either Barebone or Valhalla
Do you guys think this would be sufficient enough to remove the problem that's causing these reboot & battery drains?

I would flash eollies kj6 with the blastoff v2 if your not planning on going to ics after because that's the latest gb kernel available and then flash Valhalla or barebones (then you might have to flash blastoff again can't remember right now but it should say in the op of each rom). And I'm pretty sure when you one click back to gb that will convert back ext4 so I would format SD card and reload it before you one click back. Good luck friend
Sent from my mutt hp touchpad using Tapatalk 2

Thanks for your input! Do you think the gremlin remover is necessary, or is it overkill in the context of what I'm doing?

If you want quick and easy use my one click the other two listed is just kernels.
As for getting battery life on ICS flavored roms, well take the time using BBS and STT to figure out whats killing your battery. As long as Im not jumping between wifi and mobile data I can go around 15 hours on a battery. And I havent spent tons of time to figure out why Im not getting more battery life. But others like jeffsf has. And with that I can honestly say if your not getting battery life comparable to GB roms its YOUR fault not the rom. Most ICS roms have stuff built in that you have to use a app for. Therefore a GB rom with nothing installed will get better battery life. But once you put your stuff on and start running the battery life is not being compared properly. The reason for this is most people will keep a app just because they are use to it and not even know the ICS rom has it built in.

I personally think most of our batteries - if still using the one that came with the phone - are starting to run their course. New batteries are inexpensive on Amazon.

I think you guys are misunderstanding my issue. My problem isn't the battery draining quickly over a certain amount of time due to regular use. My problem is that once my phone crashes and reboots, the battery will literally go from whatever percentage I was at, all the way down to below 10%. I can be at 90% battery, and if my phone crashes, it will be on low battery once it powers back up. I'm not sure what's causing the crashes, which is why I'm just trying to start at step 1 and work my way from there.
To test if it was the battery simply draining out very quickly, I turned brightness to 100% and turned WiFi & GPS on, and disallowed the screen from turning off. The battery drained normally.

That happens to me... It gets fixed by shutting down and taking out the battery for 30 seconds.

Sounds like a bad battery

i had the same issue and also would get diff battery levels when booting with or without charger plugged in...i used a toool from market to calibrate battery. i cant remember exact app but will post back if i find it.
edit:
it was "Battery Calibration"
by NéMa
and i had to do it a couple of times to get it to set in.

Like thecontroller stated its a bug and you should be able to correct it by pulling the battery out and waiting a few extra seconds. If it does it still hold the power button down for a little while with the battery out.
Do this next time you have a crash on ics. Time how long it takes for the phone to restart. It is seems abnormally long you could have some scripts that are running on boot that is causing issues.
Calibrating the battery can be done manually. All you have to do is delete the batterystat.bin file. That is all those apps do. And really If you fully charge your battery it should be deleting itself.

http://forum.xda-developers.com/showthread.php?t=1445698
Quote:
Originally Posted by kalel29 So,all the battery calibration tutorials are useless???????
In a nutshell, yes. You are only putting extra stress on your battery by "tricking" it according to various calibration guides. Batterystats.bin file is generated for a reason. Batterystats.bin is in /data partition, so after you install a new ROM that wipes your previous data, it gets wiped too. So, "Wipe battery stats after installing a new ROM", which is a cliche among those guides, is pointless. Last but not least, batterystats file is simply a logging tool that monitors your battery behavior. The "stats" part is pretty self-explanatory. The actual Power Manager lies in kernel, not in /data partition which accessible to anyone.

SBD all that info is true. But if you use the aroma installer it will backup and restore the data partition. Not sure if it will restore the batterystat.bin file or not. That is why I posted what I did. I do not believe in calibrating batteries as much as making sure they file is not storing data that is out of date.

As you guys mentioned earlier ...hard resets are the best ....I find our batteries do go bad. And when they do....they do all kinds of odd things to the device

m4127440 said:
i had the same issue and also would get diff battery levels when booting with or without charger plugged in...i used a toool from market to calibrate battery. i cant remember exact app but will post back if i find it.
edit:
it was "Battery Calibration"
by NéMa
and i had to do it a couple of times to get it to set in.
Click to expand...
Click to collapse
Battery calibrations are garbage. They do nothing. The file that any battery calibration app deletes is deleted by Android anytime you do a full charge anyway.
Sent from my SGH-T959V using xda premium

lumin30 said:
I personally think most of our batteries - if still using the one that came with the phone - are starting to run their course. New batteries are inexpensive on Amazon.
Click to expand...
Click to collapse
Not to mention the screen. Was in Costco last week, saw the old T959V on display and held mine up to it. Screen is faded bad I don't know if any of you else have noticed that lol
Sent from my SGH-T959V using xda app-developers app

Okay, so I formatted my SD card, and flashed Eollie's KJ6 using Heimdall. After that, I flashed Raver's Valhalla Black.
Initially, I didn't install anything extra other than updating gmail and superuser. Everything worked fine, apart from one random reboot. Once it booted back up, everything was normal. Today, I installed around 5 apps. I was using one of those apps (Reddit Is Fun), and while using it, the phone crashed. Once my phone booted back up this time, everything force closed, and log provider force closed over and over. I had someone text me, and right after they did my phone just crashed. I tried fixing permissions, but that didn't do anything.
Any suggestions?
--edit--
I just factory reset and tried reflashing Valhalla Black, but everything just force closes again even on a fresh install.

Boy I don't know what the hell you're doing but you are doing something very wrong.
Flash back to stock (complete stock). http://forum.xda-developers.com/showthread.php?t=1358498
Then flash AntonX http://forum.xda-developers.com/showpost.php?p=19601810&postcount=2
Once you do that, flash a ROM.

I just went through the same issue. This was going on rarely for several weeks then got more frequent. I have a couple of extra batteries that T-Mobile sent me when I first got the phone....swapped in one and its been 10 days without a single issue. Before posting here tonight I put my old battery back in and guess what? Symptoms came back within 30 minutes....so....
Sent from my SGH-T959V using xda app-developers app

Then there's your answer, you need a new battery my friend

Just so weird, I don't see how a battery can affect the OS in that way haha. I've ordered a new battery anyway, they're only like $5 on Amazon, but I'm gonna try your steps anyway, controller. Thanks a lot guys.

[Q] Horrible battery life

I don't know if this is common but no matter what rom I flash I get horrible battery life. I always do a clean wipe, full wipe whatever you want to call it, phone lasts maybe 6 hours of usage. Also device sometimes gets very hot, rooted use twrp 2.8.5.0 and am on the latest firmware any ideas? When I use the stock rom battery seems fine. Thanks.

iguate12345 said:
I don't know if this is common but no matter what rom I flash I get horrible battery life. I always do a clean wipe, full wipe whatever you want to call it, phone lasts maybe 6 hours of usage. Also device sometimes gets very hot, rooted use twrp 2.8.5.0 and am on the latest firmware any ideas? When I use the stock rom battery seems fine. Thanks.
Click to expand...
Click to collapse
I hate the battery life on this phone, it ****ing sucks no matter what you do and idk why

iguate12345 said:
I don't know if this is common but no matter what rom I flash I get horrible battery life. I always do a clean wipe, full wipe whatever you want to call it, phone lasts maybe 6 hours of usage. Also device sometimes gets very hot, rooted use twrp 2.8.5.0 and am on the latest firmware any ideas? When I use the stock rom battery seems fine. Thanks.
Click to expand...
Click to collapse
Something is likely holding your phone awake for long periods of time. Impossible to know with the lack of information you've provided. Check out this thread here (It's in the Nexus 5 forums, but it's relevant for all phones) on how and what to post to analyze your battery: http://forum.xda-developers.com/google-nexus-5/help/battery-life-help-troubleshoot-battery-t2785128

Impossible help without knowing what your running, ROM, apps, settings , etc. Start off by installing wakeloc detector and go from there.

so?
what is the best custom rom and kernel for the best battery life?