I am new to electric and lipos. I also am very fussy with the way I take care of my stuff and like to do things the right way. My question is I am upgrading from a Brain 977 to a Brain 989 in preparation for my E Revo and Lipos. Do I need a balancer for this charger and if so where can I get a good one and how do they work? Is it plugged in between the charger and pack? Thanks, Jeremy