POWERSTAR 3 Pack - Replacement Battery for Razor MX500 MX 500 650 MX650 Dirt Rocket Sc PowerStar Brand Batteries 2 Year Warranty L- 5.94 W- 3.84 H- 3.78 F2 PowerStar batteries have an excellent charge acceptance and recovery capability even after deep discharge. Because of the use of Lead Calcium grids alloy, PowerStar SLA battery can be stored long periods of time without recharge.