OPTI-UPS DS3000I - Manual (Page 15)

Installation
DS-I 1-3k UPS User Manual
2. Take out battery cable delivered with the UPS. One end of battery cable is a plug and
the other end has 2 open wires.
3. Connect the RED wire to the “+” terminal of the battery. Connect the BLACK wire to
the “-“terminal of the battery.
Notice: DO NOT connect the battery plug to the battery socket of UPS first, otherwise, it
may cause electric shock.
4. Connect the external battery plug to the battery socket on the rear panel.