APC External Battery Pack for Smart-UPS Extended Run SMX-Series (up to 1500 VA), 48V, 2U Rackmount/Tower Convertible (SMX48RMBP2U) - Newegg.com
APC Smart-UPS SMT1500RM2UC - UPS (rack-mountable) - AC 120 V - 1 kW - 1440 VA - 1 x battery - USB, serial - output connectors- 6 - 2U - black - with APC SmartConnect | Dell USA