Battery Systems for Smart-UPS APC Smart-UPS X 120V External Battery Pack Rack / Tower UPS options: Extra battery Before you buy, check the battery compatibility thoroughly://www. apc. com/products/family/index. cfm?id=152 - Operating environment: 0 - 40 ° C - Relative humidity: 0 - 95% - Height n. p. m. During work: 0-3000 m - Temperature (storage): -15 - 45 ° C - Relative Humidity (Storage): 0 - 95% - Height n. p. m. (Storage): 0-15000 m - User's Guide - Buckles for mounting in industrial cabinets - Height: 85 mm - Width: 432 mm - Depth: 667 mm - Height in the industrial cabinet: 2U - Battery Type: Maintenance-free sealed lead-acid battery with electrolyte gel-tight - Battery installation: Closed battery compartment - Estimated battery life (in years): 3-5 - Number of RBC sets: 2 - Number of battery blocks in series: 10