This Futaba 6.6V 2100mAh LiFe transmitter battery is designed to be used with Futaba 18SZ,16SZ, 14SG, 10J, 6K, 6J, 4PV, 4PX/R, 4GRS, 4PKS/SR and 4PL/LS transmitters.
Compatible charger-constant current/constant voltage balanced charging system.

Note: This battery must not be used with receivers. When a servo moves, the protection circuit built into the Futaba FT2F2100B activates and operation stops. This can be very dangerous when your model is in flight.

Specifications:
Nominal Output Voltage: DC6.6V
Nominal Capacity: 2,100mAh
Number of Charge/Discharge Cycles: Approximately 500 (depends on usage)
Ambient Temperatures:
Charging: 32° to 113°F (0° to 45°C)
Discharging: -4° to 140°F (-20° to 60°C)
Storage: -4° to 77°F (-20° to 25°C
Dimensions: 1.7 x 3.1 x 0.67" (42.5 x 79 x 17mm) approximately
Weight: 3.6oz (101g) approximately