Tenergy 7.4v 1000mAh 20C Airsoft LiPo 2-Cell Nunchuck Battery

"At first, I couldn't have been more thrilled with these Tenergy Li-Po's. Both the 7.4v and the 11.1v nunchucks fit in my ICS CXP 08's handguard (with a MOSFET in there too), and for 1000mAh, they lasted a long time. About a few months after ordering the 7.4v and the 11.1v (1-2 months apart from each other), they both died within the same week. My Tenergy Li-Po charger and my MOSFET both indicated that they were damaged, even though there is no damage to the batteries.

Pros:
-Compact

Cons:
-Over priced
-Die too quickly

If I were you, order quality RC Li-Po batteries from a hobby website or store that have reviews on the items.