http://www.hobbycity.com/hobbycity/s..._hardcase_pack
Here is the best Lipo battery on the entire web for only $33.95. The run time, quality and punch is far superior to that of cheaper cells that some companies try to pass off as being good, when in actuality they are subpar. I would stay away from Tenergy cells, as i have experience with them first hand and I will tell you that I was very disappointed. Maybe things have changed, but I personally wouldn't chance the risk of ever buying them ever again. The Lipo pack that i pointed you out to is basically the same as the SMC Lightning Volts 4000Mah pack, but for a fraction of the price. The quality of the cells are right up there with even Team Orion, but much better for the wallet. If your not happy with the pack, I will personally refund you the money out of my own pocket.