HP 420 620 ProBook 4320 4420 4520 Compaq 320 420 620 Battery PH06 593573-001 Number of Cells: 6 CellsVoltage: 10.8VAmperage: 4.4APH06, BQ350AA, BQ350AA#ABA, 593572-001, 587706-121, 587706-221, 587706-251, 587706-421, 587706-751, 587706-851Compatible Models:HP Compaq Compaq 300 320 Series models HP Compaq Compaq 300 320HP Compaq Compaq 300 321 Series models HP Compaq Compaq 300 321HP Compaq Compaq 300 325 Series models HP Compaq Compaq 300 325HP Compaq Compaq 300 326 Series models HP Compaq Compaq 300 326HP Compaq Compaq 400 420 Series models HP Compaq Compaq 400 420HP Compaq Compaq 400 421 Series models HP Compaq Compaq 400 421HP Compaq Compaq 400 425 Series models HP Compaq Compaq 400 425HP Compaq Compaq 600 620 Series models HP Compaq Compaq 600 620HP Compaq Compaq 600 621 Series models HP Compaq Compaq 600 621HP Compaq Compaq 600 625 Series models HP Compaq Compaq 600 625HP Compaq ProBook 4300 Series models HP Compaq ProBook 4320s, 4321s, 4325s, 4326s, 4320tHP Compaq ProBook 4400 Series models HP Compaq ProBook 4420s, 4421s, 4425sHP Compaq ProBook 4500 Series models HP Compaq ProBook 4520s, 4525sHP Compaq ProBook 4700 Series models