Ok, I know this is the newbie area and we're not suppose to flame, but holy shit, more than half the information you've asked is in the FAQ or can be found with even a slight bit of research on your own. This section is here to help point new players in the right direction, or provide answer to common but less known questions -not to give people a step-by-step on how to wipe their ass.
Now, if you want to know some stuff about batteries, have a read of this website:
And on charging:
It has TONS of info on just about every non-airsoft specific battey question one could have.