This Laptop Battery will ensure you have enough power to run your basic apps for hours without having to be in the power outlets. In addition, it has been rigorously tested to conform to all standards to ensure its durability and performance.Compatible Models: HP Probook 4330S - 4331S - 4430S - 4431S - 4530S - 4535S - 4435S - 4436S - 4440S - 4441S - 4446S - 4540S - 4545S.Compatible Part Numbers: 633733-1A1 - 633733-321 - 633805-001 - 650938-001 - PR06 - PR09 - QK646AA - QK646UT - LC32BA122 - 3ICR19/66-2.HSTNN-DB2R - HSTNN-I02C - HSTNN-I97C-3 - HSTNN-I97C-4 - HSTNN-I98C-5 - HSTNN-I99C-3 - HSTNN-I99C-4 - HSTNN-IB2R - HSTNN-LB2R - HSTNN-OB2R - HSTNN-Q87C-4 -HSTNN-Q87C-5 - HSTNN-Q88C-4 - HSTNN-Q88C-5 - HSTNN-Q89C - HSTNN-XB2E - HSTNN-XB2F - HSTNN-XB2G - HSTNN-XB2H - HSTNN-XB2I - HSTNN-XB2N - HSTNN-XB2O -HSTNN-XB2R - HSTNN-XB2T - HSTNN-XB3C