User Guide

Battery Replacement
20
NXA-UPS1500 Uninterruptible Power Supply
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The remaining two wires from the wiring package complete the serial circuit. Connect the red
wire first to a red contact on one battery and then to a black contact on the other in the pair.
Likewise, connect the black wire first to the remaining black contact, then to the remaining
red contact in the second pair.
 At this point, flip the batteries so that their wide and long sides face down. Make sure that the
contacts of each battery face the side containing contacts on the other in its pair. Gently put
tension on the wires to take up any slack; the wire harness should be hanging to one side. The
wires themselves should run between the battery pairs until they emerge from the side. If any
wire should hang over the top of the batteries, gently press it down between the batteries to
keep it out of the way.
 Assemble the battery case around the battery pairs. When installing the battery in the unit, the
wire assembly will hang out from the right side of the battery pack.
Replacing the UPS Battery - Step One
When attaching the wire harness to the battery pairs, note the red-black wire pairs
coming from the connector. The black and red wires in each set emerging from the
connector must be attached to its matching contact in only one battery pair;
connecting a red wire to one battery pair and a black wire to the other battery pair will
not complete the circuit and the battery pack will not work.
FIG. 18 Replacing the Battery - Step 1