When do you chage?
1. When your battery is totally flat.
2. When your battery indicates 1 or 2 bars.
3. (KIASU) When your battery inidcates 3 bars (after playing for a while).
I'm not very sure of the correct way to charge it.
I'm currently doing no. 2
lolx... normally i wait for batt left 1 bar or barless haha
Use until left 1 or no more then charge is the best way to extend your battery life...
Normally I plan my day first. Like for example today I'm going out and I will bring it along so I will have to charge it before hand.