This is a Gens ace 2300mAh 6.6V 2S1P Li-Fe Battery for Radio Transmitter. Not like the other RC batteries, this battery has low discharge rate, only 1C, equipped with JST-XHR balance plug and Futaba discharge plug, suitable for 18SZ 14SG 10J T8J futaba radio transmitter.

Gens ace 2300mAh 7.4V 2S1P Li-Fe Battery Specs:
Capacity: 2300mAh
Voltage: 6.6V/2S
Discharge Rate: 1C
Weight: 130g
Size: 78X41X17mm
Charge Rate: 0.2C Recommended, 0.5C Max