10.80V 4400mAh Li-ion Hi-quality Replacement Laptop Battery for HP 420 425 4320t 620 625 HP ProBook 4000 Series COMPAQ 320 321 325 326 420 421 620 621 Compatible Part Numbers: 587706-751 593572-001 BQ350AA HSTNN-CB1A Voltage: 10.80V ///Capacity: 4400mAh Battery Type: Li-ion///Color: Black Dimension: 268.50 x 41.50 x 20.30 mm///Weight: 474.40 g