This is the Dynamite LiPo Battery 11.1V 1400mAh 3S 30C Long with EC3 Connector.
Specs:
Type: LiPo
Capacity: 1400mAh
Voltage: 11.1V
Connector Type: EC3
Wire Gauge: 16AWG
Configuration: 2S1P
Length: 3.93 in (100mm)
Width: 1.20 in (30.5mm)
Height: 0.73 in (18.5mm)
Maximum Continuous Discharge: 30C
Maximum Burst Discharge: 60C