1150mAh Palm Tungsten X, TX Lithium Polymer Battery High Quality, high capacity, light weight rechargeable DC 3.7V Lithium Polymer 1150mAh battery. Longer battery life than the original battery that comes with the PDA. Best replacement for the original Palm Tungsten X, TX series battery pack. No memory effect. Can be charged or discharged as needed without loss of capacity. Overcharge protection, with built-in battery life microchip.