CSE&reg; New Replacement Laptop Battery For HP ProBook 4321 4321s 4320s 4325s 4520s 4525s HSTNN-DB1A HSTNN-CB1A [Li-ion 10.8V 6-cell 5200mAh] - 12 Months Warranty Battery type: Li-ion; Capacity: 5200mAh/56WH; Cells: 6-cell; Voltage: 10.8V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support,12-month hassle-free warranty. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time: the actual operation time will depend on how much electricity is required by the device and how you use it.