HQRP 3400mAh Internal Li-Ion Battery for DELL X50 / 35h00056-00 with Back Cover + HQRP PDA Screen Protector 3400 mAh High Capacity, 3.7V, with Longer Runtime HQRP Li-Ion Rechargeable Internal Battery + HQRP PDA Screen Protector Made from High Quality Cells 100% compatible with original batteries and chargers for DELL X50; 200 days warranty.