This is the Thunder Power Pro Power "G4" 45C, 2S, 7.4V, 2650mAh Li-Polymer Battery. Thunder Power G4 series batteries deliver the same mAh capacity as previous Thunder Power batteries, but with upwards of 40% more power and 6-times more cycle life than most other 25C to 40C+ continuous discharge rate capable batteries! This makes them the perfect choice for use in a wide variety of aircraft.

Specifications:
Type: Lithium Polymer
Capacity: 2650mAh
Voltage: 7.4V nominal
Number of Cells: 2
Weight: 160 grams
Configuration: 2S
Dimensions (LxWxH): 128x42.0x14.0mm
Maximum Continuous Discharge: 45C (119A)
Maximum Burst Discharge: 90C (238A)