This is a Dynamite 7.4V 3200mAh Li-Ion Receiver Pack.
Specs:
Application: Receiver pack
Battery Balance Connector: JST-XH
Battery Type: Li-Ion
Battery Voltage: 7.4V
Capacity: 3200 mAh
Cell Configuration: 2S1P
Connector Type: JST-XH
Hard Case: No
Height: 0.77 in (19.5mm)
Length: 2.76 in (70mm)
Number of Cells: 2
Watt Hours: 23.68 watt hours
Width: 1.5 in (38mm)