TPE Laptop Battery for HP Probook 4530s 4440s 4430s 4330s 4331s 4435s 4431s 4535s 4536s 4441s 4446s Series, fits P/N 633805-001 HSTNN-IB2R 633733-321 [ 11.1V 5200mAh 6 Cell ] Battery type: Li-ion; Capacity: 5200mAh/56WH; Cells: 6-cell; Voltage: 11.1V; 100% brand new from manufacturer. Under 100% Aging Test. Up to 503 cycles life, low self-discharge, no memory effect; Dual IC chips provide protection against short circuit, over-discharge, overcurrent. CE/FCC/RoHS certified for product safety. 24/7 email support, 15-month hassle-free warranty. Grade A Cell ensures fast charging and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time for standard batteries(6-Cell, 4400mAh): Around 3 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.