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

DOUBLE YOUR FLIGHT TIME!
This 2S 4000mAh lithium polymer battery pack is a best fit for the Spektrum DX7s, DX8, and DX9 transmitters, and uses two times as much runtime as the stock 2000mAh battery! This lipo likewise features an internal cell balancer and a built-in safety present circuit to prevent the battery from being overcharged and triggering damage to both the battery and your radio.

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

Functions
Perfect fit for the Spektrum DX7S and DX8 transmitters
Deals two times the flight time of the stock battery
Consists of internal cell balancer
Functions built-in safety 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 only be utilized in the new DX7S model. It cannot be utilized in older Spektrum DX7 models.