The factory original Motorola BX81 Battery (BX81), Motorola RAZR2 V9m Battery is a li-ion extended capacity battery that is rated at 1350 mAh. The Motorola RAZR2 V9m Extended Battery requires an extended battery door (sold separately). Allow two to three complete charge cycles for the Motorola SNN5810 / BX81 battery to reach full performance.