RM2s aren't great, and they tend to burn out (so don't hold down the rev button longer than you have to!) But if you don't think you can properly take care of a rechargeable battery pack they can give you a little better performance while still using normal AA batteries.
LiFe batteries are a little more stable than LiPos, but they aren't as compact and the voltage is a bit lower. For instance https://hobbyking.co...fepo4-pack.htmlor https://hobbyking.co...fepo4-pack.html
Charger for them: https://hobbyking.co...discharger.html
If you do rewire always try it with normal AA/alkaline batteries before connecting a battery pack!
Edited by jwasko, 26 November 2016 - 03:46 PM.
-Jwasko, STILL Sole Surviving member of Steel City Nerf and Sober Sister of the Sex Dwarves
We NERF ON all day, and FUCK OFF all night