I use a 2 cell 1100Mah 8c 15c burst from XUS HOBBY on ebay. Just do a search for li poly. I have 6 packs now that I picked up from $17 - $20. I get 10 minutes of 3D flying with the PARk 370. There are two 370 motors though one is for two cell and the other for 3 cell. If you get the one for 3 cell that have these batteries too for 1/3 more the price. Although the discharge rate is only 8C the packs barely get warm after 10 minutes adn haev all the power you could want.