Two pcs Tenergy Propel 7.2V 4200mAh Flat NiMH High Power (40A Drain Rate) Battery Packs with Tamiya Connectors for RC Cars Tenergy Sub C 4200mAh Propel Model--Beat or match IB Packs Continuous Discharge Rate: 10C ( 42Amps) Fits with popular standard 7.2V RC cars like Traxxas, LOSI, Associated, HPI, Tamiya, Kyosho, etc. Standard Dimension: 5.38"x1.87"x0.95" inch, fits all RC10 cars NiMH technology enables convenient charging at any time. No cell memory effect. No need to fully discharge before recharging