BR24BPG APC Back-UPS Pro External Battery Pack extends runtime for compatible 1500VA Back-UPS Pro systems with a 24V lead-acid battery, 372VAh capacity, four 9Ah batteries, automatic recharging via BR1500G, TÜV certified, 4–6 year battery life, 2-year warranty, and compact 11.85" x 4.41" x 15.04" design. Brand new available at Chicago Computer Supply.