Dekcell Li-Polymer Battery Replacement + Back Cover for HP iPaq 5100 ; 5150 ; 54... 2800 mAh High Capacity, 3.7V, with Longer Runtime; Li-Polymer Rechargeable Internal Battery; Made from High Quality Japan Cells 100% compatible with original batteries and chargers for HP iPaq 5100 5150 5400 5450 5455 5500 5550 5555