Battery problems - Nexus 7 Q&A, Help & Troubleshooting

I am having some battery issues, and I cannot understand why.
I was on JB 4.3 stock and rooted, and battery was working fine. But when I updated my tablet to Kit Kat (I flashed purity rom), my battery drained because of google search. On the battery usage, sometimes it had more than 40%.
So, I flashed CM, because I thought it was probably a bug from the rom. But now my battery drains with google keyboard, it keeps downloading data all day long. If I put my nexus on airplane mode the battery doesnt drain.
Any help would be appreciated,
thanks in advance!

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[Q] Battery Drain

Hey guys, I just downgraded from CM 6 to CM 5.0.7. Everything seems to be working perfectly, only my battery is draining quicker than usual. What's the best solution to solve this?
I had a similar issue with 5.0.8-DS. Ended up letting my phone charge overnight, wiping battery stats from recovery, and letting it drain until the phone turned off without plugging it back up. Worked for me.

Battery life after 4.3 upgrade is bad.

Received OTA, installed the 4.3. But after the upgrade (about 48 hours), my battery life has taken a hammering.
Fully charged last night, did literally nothing so far. Just a few calls. No games or browsing at all. But battery is down to 50%. Stock and rooted.
I saw a few posts regarding same. But no definite answer. Any pointers what I should do here?
cheers!
Not sure why the CPU seems to be running at max frequency for such long time. I think that's causing the issue.
Nexus Battery issue aft 4.3 update
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Honestly i would re-flash the 4.3 images or something.
My phone has been 1 day 2h (or 26h) since last charge, with 2h screen on time and i have 57% battery left. Everything is stock (will flash franco.kernel soon-ish), but stock battery seems real good so far. I do not have loads of apps or anything like that yet - the phone is freshly installed with 4.3 and i only use whatsapp/hangouts/calls/sms/chrome/facebook/google now... no games or heavy use.

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Battery Drain

Please my battery drain so fast, i installed Aurora Full N4 Port 3 v9.0http://forum.xda-developers.com/galaxy-s4/i9500-develop/aurora-note-4-port-beta-2-t2988026 can i get it back to normal?? without changing this ROM
Which phone do you have?
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Galaxy S5 Sucks On battery life!

Help Please!!
Battery is draining extremely FAST!!
Did everything including wipe system and wipe cache
Using TWRP
Refashed the ROM
But didnt solve the POOR battery drain issue.
Here is a story of the problem i am having
I charge the phone on a evening to 100%
I then go to sleep with 100%
Wifi Is off location is off
The only thing i have is my alarm clock to wake me up (Which works)
Wake up and realise that my battery had dropped to around 70% just on idle with alarm
I used the Wakelock Detector [ROOT] to detect any wakelock stuff
Then greenified pretty much every app except the google and some omni stuff because it said not hibernating.
Reflashed ROM, i have nothing at all installed,NOTHING,no app from the play store
Just stock Gapps.
Still the battery is draining like usual.
See Below For Photos
What does Mobile Network Mean and why is it soo red?
Can someone help me please or at least suggest a suggestion that could work.
I dont want to go to linegeOS as it is too plain.
Thanks for reading this
By the looks of it, it seems that you are running a custom Rom so I can see why you'd be confused. My question is are you still using a stock battery because I had a similar problem with mine running stock so I flashed Resurrection and I still had battery drain problems. I would recommend purchasing an aftermarket battery from Powerbear on Amazon. It's around $20 which is quite step compared to purchasing another stock battery but (speaking from experience) it's worth the purchase.

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