I have a Nexus 7 2013 , I use and change custom roms very often.
Every thing runs fine but the only problem I face is bad battery timing.
The situation is even bad on non-rooted stock firmware.
The battery only last 3 to 3.5 hours while browsing and about 40 minutes of gaming and without gaming I get about 4 to 4.5.
I run greenify very casually so no apps run in background and drain battery but battery life is still very poor.
Any suggestions will help greatly.