Replacement notebook battery for HP COMPAQ 6530b 6535b 6730b 6735b Elitebook 6930P 8440P replaces KU531AA 463310-542 463310-544 463310-763 484786-001 486296-001 491173-542 Specs Lithium Ion 6-cell 10.8V 5200mAh 56Wh