This is Traxxas 2S "Power Cell" 25C LiPo Battery w/iD Traxxas Connector (7.4V/5800mAh).
NOTE: This battery requires a Traxxas iD equipped LiPo charger to balance-charge
Specifications:
Configuration: 2S2P
Continuous Discharge: 25C (145A)
Max Burst Rate: 50C (290A)
Watt Hours: 42.92
Charge Rate: 1C (5.8A)
Max Charge Rate: 2C (11.6A)
Dimensions: 5.3 x 0.98 x 1.8" (135 x 25 x 45mm)
Weight: 10.2oz (290g)