V7's high-quality replacement notebook batteries are made from the highest-quality cells available & incorporate all of the standard logic boards, thermal protectors, thermistors & circuit breakers to ensure maximum levels of safety, reliability & efficiency. V7's wide selection is compatible with top-line products from all major manufacturers & meets or exceeds original OEM specifications to provide longer-lasting quality & no memory effect. Features Technology: Li-Ion, Voltage 11.1V Capacity: 4500m Ah, Cells: 6 Cell Compatible with: 515 550 610 6530S 6531S 6720S 6730S 6735S 6780S 6820S BUSINESS NOTEBOOK 550 BUSINESS NOTEBOOK 6720S BUSINESS NOTEBOOK 6780S COMPAQ 6720S DC7700