***** **********Best Quality Guranteed.
*****Battery type: Li-ion;
Capacity: 4400mAh;
Cells: 6-cell;
Voltage: 10.8V.
*****Compatible Models: HP ProBook 4330s / 4331s / 4430s / 4431s / 4435s / 4436s / 4440s / 4441s / 4445s / 4446s / 4530s / 4535s / 4540s / 4545s*****Compatible Part Numbers PR06 / PR09 / QK646UT / 633805-001 / HSTNN-DB2R / HSTNN-LB2R / HSTNN-OB2R*****All products are Certified by CE, FCC for safety. Strict guidelines for compatibility, and standards compliance for environment safety. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. *****Operation time for standard batteries(6-cell, 4400mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it. 24 x 7 email support, 12-month hassle-free warranty.