This is an optional E-flite 800mAh 2S Li-Poly 30C Battery Pack w/JST Connector. This battery fits the CX family of helicopters.

Specifications:

• Battery Type: LiPo
• Capacity: 800mAh
• Voltage: 7.4V
• Length: 2.75 in (70mm)
• Width: 1.00 in (25mm)
• Height: 0.50 in (13mm)
• Configuration: 2S
• Wire Lead AWG: 18
• Connector Type: JST
• Maximum Continuous Discharge: 30C