Alliboo New Laptop Battery for Hp Probook 4330s 4331s 4430s 4431s 4435s 4530s 4535s 4536s 4440s 4441s 4446s 4540s 4545s Series - Pr06 Pr09 [6-cell 10.8v 4400mah] Battery type: Li-ion; Capacity: 4400mAh; Cells: 6-cell; Voltage: 10.8V. 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. 24 x 7 email support, 12-month hassle-free warranty. 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.