The Back-UPS Pro BR24BPG UPS (sold separately) provides instant battery power to your critical electronics when the power goes out, reducing risk of damage and keeping you connected and available both personally and professionally. When power availability is of the utmost importance, the BR24BPG Extended Run Battery Pack keeps your computer, network, or gaming systems running longer during a power outage. The BR24BPG features four 9Ah 24-volt batteries to complement the BR1500G's two. Adding this extended run battery pack to your Back-UPS Pro system dramatically increases total runtime for added convenience and peace of mind. The BR24BPG is the perfect match for the BR1500G UPS. A heavy-duty connector links the two, and the BR1500G automatically recharges the additional UPS battery pack. Complementary styling ensures a consistent look. The BR24BPG UPS battery pack is covered by a two-year limited warranty. Package Contains APC BR24BPG Extended Run Battery Pack for Home UPS and user manual.