I'm probably going to buy a 2 cell 1000 mah/7.4v 20C Li Po battery w/balencer. (1) what does the balencer do. (2) Will I have a longer flight with this battery or my 1100 mah 9.6v Nimh. (3) Will I have more power with the 9.6v nimh or the 7.4v Li Po. (4) How much more of an upgrade would it be to get the 3 cell 11.1v Li Po instead of the original. I'm wanting to get a brushless motor and it seems that most people are using the Li Po's with the brushless rather than the Nimh. (5) about how long would it take to charge the Li Po batteries I mentioned?