TAUPO Laptop Battery for HP Probook 4530s 4535s 4540s 4545s 4440s 4430s 4431s 4435s 4330s 4331s Series, fits P/N 633805-001 HSTNN-IB2R 633733-321-[4400 mah/ 49wh]-12 Months Warranty Battery type: Li-ion; 6-cell; Capacity: 4400mAh; Voltage: 11.1V Color: Black Compatible Models: HP Probook 4330S 4331S 4430S 4431S 4530S 4535S 4435S 4436S 4440S 4441S 4446S 4540S 4545S. Fit P/N: 3ICR19/66-2 633733-1A1 633733-321 633805-001 650938-001 PR06 PR09 QK646AA QK646UT Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. CE-/FCC-/RoHS-Certified for safety, 12 months hassle-free warranty. Please check if this battery is compatible with your computer before purchasing.