Tenergy 2 pack 9.6V rechargeable NiMH battery pack features a high capacity rating of 2000mAh. .6V RC battery pack will work with most hobby units such as RC monster trucks, Lionel Polar express trains, Tonka ricochet RC trucks, RC beetles, RC Hummers, Traxx Tyco cars, radio shack RC cars, and Nikko RC cars. NOT compatible with Spike the Dinosaur. RC replacement battery requires minimal maintenance, recharge anytime without needing to discharge and drain the battery. Tenergy's nickel metal hydride battery pack has no memory effect which helps retain its max energy capacity every time. Flat pack configuration replacement NiMH battery pack measures: length 4.09"; width 2.32"; height 0.63" with built-in standard Tamiya connector.