MPF Products X865745-002, P21GK3, 21CP4/106/96 Battery Replacement Compatible with Microsoft Surface RT 9HR-00005. Replacement for the following battery model/part numbers: X865745-002 , X865745-003, P21GK3, MS991109-ZZP12G01, 21CP4/106/96. Compatible with the following models: Microsoft Surface 1, Microsoft Surface RT, Microsoft Surface 1516, 9HR-00005. PLEASE NOTE: THIS REPLACEMENT BATTERY IS NOT COMPATIBLE WITH ANY OTHER MICROSOFT SURFACE TABLET. IT IS ONLY COMPATIBLE WITH THE LISTED MODELS. 7.4V 4250mAh 31.5Wh Lithium-Polymer Battery. Includes Free Installation Tools (When Purchased from MPF Products). 1 Year Replacement Warranty (When Purchased from MPF Products). MPF Products is a Registered Trademark.