7.4V 1100mAh 20C Lipo batteryDescription:

Lithium Polymer batteries are the newest available batteries for airsoft and other hobby toys. They are designed as a lightweight, high output power source. This 7.4v Li-Po battery can deliver more power than 9.6v Ni-MH large type battery with only half of the size and a third of the battery cells.
Specifications:
Manufacturer: I Power
Model: 7.4v 1100mAh 2s 20c LiPO Stick Battery
Connector Type: Mini Tamiya
Size: 11-20-110mm