Ok, Ive been researching for 4 days now and Ive always read that the m11 need a 3 cell 11.1v lipo pack but on amain site they say this one will work with the m11 perfect. ProTek R/C Li-Poly 3C Stick Receiver Battery Pack (7.4V/2100mAh) (No Balance)
[PTK-LP-RX2100-L-2S-NB]

Here is the link http://www.amainhobbies.com/product_...mAh-No-Balance