This is an E-Flite 6S 910mah lipo with an EC3 connector.
Specifications:
Application: Heli/Airplane
Capacity: 910mAh
Battery Voltage: 22.2V
Wire Gauge: 16 AWG
Connector Type: EC3
Balance Connector: JST_XH
Battery Type: LiPo (3.7V per cell)
Maximum Continuous Discharge Current: 27A
Recommended Charge Rate: 0.9A (1C)
Maximum Charge Current: 2.7A (3C)
Watt Hours: 20.202Wh
Charge Protection Circuitry: No
Product Height: 1.69 in (43mm)
Product Length: 2.80 in (71mm)
Product Weight: 4.97 oz (141g)
Product Width: 0.98 in (25mm)
Discharge Lead Length: 4.13 in (105mm)
Balance Lead Length: 1.97 in (50mm