Laptop Battery - designed for HP 510, HP 511, HP 550, HP 610, HP 615, HP Business Notebook 6720s, HP Business Notebook 6730s, HP Business Notebook 6735s, HP Business Notebook 6820s and HP Business Notebook 6830s, Lithium-ion (Li-ion), 4400 mAh Have you been experiencing battery drain problems? The battery AVACOM for HP Business 6720s, 6730s, 6820s, 6830s, HP 550 Li-Ion 10.8V 4400mAh is a backup power supply for selected HP laptops. A dead laptop battery or a blackout won't catch you off guard. A backup laptop battery is useful as a second battery when you are on holiday and you can't access an electrical outlet, but still want your laptop to be running. This model comes equipped with 6 piece(s) high-quality cells and offers a capacity of 4400mAh. AVACOM for HP Business 6720s, 6730s, 6820s, 6830s, HP 550 Li-Ion 10.8V 4400mAh Battery Key Features Alternative Lithium-ion (Li-ion) battery Safe alternative to the original battery Capacity: 4400mAh, voltage: 10,8V...