Common Sense RC Lectron Pro 7.4V 4000mAh Lipo TX Battery for the Spektrum DX7S,

DOUBLE YOUR FLIGHT TIME!
This TWO 4000mAh lithium polymer battery pack is an ideal suitable for the Spektrum DX7s, DX8, and DX9 transmitters, and provides two times as much runtime as the stock 2000mAh battery! This lipo also features an internal cell balancer and an integrated security present circuit to prevent the battery from being overcharged and causing damage to both the battery and your radio.

Compatible With:
Spektrum DX7S Transmitters
Spektrum DX8 Transmitters
Spektrum DX9 Transmitters

Features
Perfect suitable for the Spektrum DX7S and DX8 transmitters
Offers two times the flight time of the stock battery
Includes internal cell balancer
Features built-in security present circuit to prevent your battery from being overcharged

Measurements:
Length: 68mm (2.68 in.)
Width: 52mm (2.05 in.)
Height: 19mm (0.75 in.)
Weight: 143g (5.04 oz)

Please Note: This lipo can just be used in the new DX7S model. It cannot be used in older Spektrum DX7 designs.