This is the Associated Reedy 7.4V 7000mAh 2S 65C LiPo Battery with a 5mm socket.
Associated and Reedy’s 7000mAh 65C LiPo battery features heavy-duty 5mm socket for high current applications such as 1/8 scale eBuggy, Short Course 4WD, and 1/10 scale Touring Car. You’ll certainly appreciate the improvement in power output achieved by utilizing a lower resistance connector.
Voltage: 7.4V (2S)
Dimensions (mm): 138.8 x 46.8 x 25.0
Max. Charge Current: 14.0 (2C)
Discharge: 65C cont., 120C burst
Weight (g): 318