2880mAh Extended Battery fits HP iPAQ rx3000 / rx3100 / rx3115 / rx3400 / rx3700 series High Quality, high capacity, light weight rechargeable DC 3.7V Li-Ion 2880mAh battery. Longer battery life than the original battery that comes with the PDA. Best replacement for the original HP iPaq rx3000 / rx3100 / rx3115 / rx3400 / rx3700 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.