Replacement Laptop Battery for HP ProBook 4530s, HP ProBook 4535s, [6 Cell, 10.80V,4400mAh,Li-ion], Battery type: Li-ion; Capacity: 5200mAh Voltage: 11.1V;Cells: 6-cell. 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. 100% new replacement item, fast shipping from US, 12 months Warranty, 30 days money back guarantee! Built-in circuit protection. Automatic power cut off at high electric current, voltage or temperature ensures safety and extended battery life.