TAUPO New Laptop Battery Replacement for HP 620, Probook 4525S 4420s 4320 4320s 4320t 4321 4321s, fits PH06 PH09 593572-001 593573-001 [6-Cell, 11.1V] - 12 Months Warranty Battery type: Li-ion; Capacity: 4400mAh; Cells: 6-cell; Voltage:11.1V Compatible part numbers: Hp 587706-121 587706-131 587706-221 587706-241 587706-251 587706-421 587706-541 587706-741 587706-751 587706-761 592909-221 592909-241 592909-421 592909-721 592909-741 593572-001 593573-001 100% New from Manufacturer. Rechargeable Up to 500 times over life of battery CE-/FCC-/RoHS-Certified for safety, 12 months hassle-free warranty Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability