Originally Posted by eftaxias
Hi guys, first post here to thank you about the problem I had. As I see many people here had the same when drain the battery full..
I solved it by pressing the power button for about 25 sec and after then charging -not with stoch charger/cable.
My question is: To avoid this problem again what it the solution? Ok.. the easy answer is "do not drain the battery" but I mean until how much % is it safe to use without charging? And something else, same important: can I use my nexus 7 while charging?
You can use it just fine while charging, should be no problem. As for a 'safe %' there really is no way to tell. It depends from battery to battery. I've seen mine go to 3% and I've never seen this issue. Perhaps after enough charge cycles your battery calibration will have improved. But it's always safe to just try and get it plugged in around 20%
Draining it too low isn't good for its health anyway.