This is the FlightPower Evo Lite 4270 3S 11.1V LiPo Battery Pack with Balance Connector from FlightTech.
FEATURES: Ultimate lightweight power for foamies up to F3A
2C Fast Charge approved
18C Continuous Discharge
28C Burst
INCLUDES: FlightPower Evo Lite 4270 3S 11.1V LiPo Pack w/Balance Connector

SPECS: Size: 5.9 x 1.9 x 0.87" (149 x 48 x 22mm)
Weight: 11oz (306g)
Capacity: 4270mAh
Continuous Discharge Current: (18C)
Rated Voltage: 11.1V
Number of Cells in Series: 3
Max. Charge Voltage: 4.25V per cell
Min. Discharge Voltage: 3.0V per cell
Maximum Recommended Charge Current: 1C