The replacement battery tray for 1-1.5 kVA Battery Backup Power, Inc. double conversion UPS systems is pre-loaded with 3x 12 volt 9 amp hour batteries. To replace the existing battery tray simply follow the instructions outlined in the video below andor user manual. The old battery tray slides out of the existing Battery Backup UPS and the new tray slides in. The typical life of each battery tray is 3-5 years depending on usage.