Hi!
The answer on your first question is Yes!
Doesn't matter if it's a brushed or brushless motor when you use any battery. But for a brushless motor you have to use a brushless speed controll (and that one will not work for a brushed motor).

A good charger is the BC-6
http://www.mft.nu/
http://www.smartstep.se/shopimages/371145/f.jpg