So I've been having battery drain issues over the last 10 days.
I read through this thread, and downloaded OS Monitor, but nothing is jumping out at me, and I still don't know what I'm doing: http://nexus7forum.com/nexus-7-help/a-raw-newbie-with-a-couple-of-questions/
I also downloaded the smart quick settings app.
I normally leave the screen brightness as low as possible unless the charger is connected while I'm using it.
I never turn on Bluetooth, and I turn Wi-Fi of if not using it. I try to be very conservative with energy, but around 10 days ago I noticed a big drain one day, while off- charger and on Wi-Fi. I thought maybe it was over, but I'm still having trouble. Friday night I finally began notating the drops, and how slow it charges now.
I've deleted all apps I downloaded the day I noticed it, and a few other ones besides.
I bought my tablet mid September and until recently, just reading Pocket, PDFs, etc with no Wi-Fi on used about 7% an hour. WiFi web browsing was about 10%. If using web while charging, it works usually gain about 14%ish an hour despite Wi-Fi on. In sleep mode (which I use more than turning it off), it gained about 25% poet hour of charging, asleep with WiFi off.
But now I lose anywhere from a quarter to a third more energy, WiFi or not!
Seems to use about 10% or slightly more, even reading offline. Wi-Fi browsing is probably 14% or more now. The first day I noticed it, I was using Wi-Fi/discharging for 3 hours. Before, that would have put me down to around 70% from a full charge, but instead I was at 61/62%.
Smart quick settings points me toward " Android task manager" when I try to see what tasks are running. I don't know if it would be anymore helpful than OS Monitor. It also says cellular data is on, but I assume that's a weird fluke, since I'm on a 16gb n7 with no such plan/ability.