Li-Polymer 290483-B21 Battery for HP iPaq 5100 5150 5400 5450 5455 5500 5550 ... 1600 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