Amazon.com: APC External Battery Pack for Smart-UPS Extended Run SMX-Series, SMX120BP, 48V, 4U Rackmount/Tower convertible black : Electronics
APC by Schneider Electric Smart UPS SRT 72V 2.2kVA RM Battery Pack Lead Acid Leak ProofMaintenance free Hot Swappable 3 Year Minimum Battery Life 5 Year Maximum Battery Life - Office Depot