Avaya S8700 Maintenance Manual page 1118

Maintenance-Object Repair Procedures
The optional battery charger (List 11) sits at the bottom of some multicarrier
cabinets. See
Batteries
Figure 8-16. Battery Charger (Optional Part of J58890CE-2)
The charger is used only without an uninterruptible power supply (UPS). The
charger contains:
Three 48 VDC batteries for backup power to the cabinet
A DC power relay to automatically switch the batteries into the power circuit
if a main power failure is detected
8-396 Issue 1 May 2002
Figure 8-16.
Battery
Charger
battchar RBP 031996
—
Front
555-233-143