Palm Tungsten E2 series Replacement 1400mAh Extended Lithium Polymer Battery High Quality, high capacity, light weight rechargeable DC 3.7V Lithium Polymer 1400mAh battery. Longer battery life than the original battery that comes with the PDA. Best replacement for the original Palm Tungsten E2 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.