Replacing Battery(ies)
ON Series m UPS User Instruction Manual
13
Procedures
1. Lay the UPS on its right side.
2. Open the battery access door on the bottom by
removing the two (2) Phillips head screws at the
front. Retain the screws for use in step 8 later.
3. Carefully open the battery access door and slide
the batteries out of the unit.
4. For the ONm Series 300 VA UPS disconnect the
black wire, then the red wire from the battery
pack.
For the ONm Series 600 VA UPS remove the
battery connector by squeezing the two “ears” on
the sides of the connector and pulling straight
out.
WARNING:
Once the wires are removed from the
battery(ies), use caution to not contact the exposed
battery terminals due to the presence of electrical
charge.
5. For the ONm Series 300 VA UPS, using the new
battery(ies), connect the red wire to the red
positive (+) terminal on the battery.
NOTE:
In the next step be aware that a small arc may
occur while connecting the black wire to the battery
terminal.
6. Connect the black wire to the (-) terminal on the
battery.
For the ONm Series 600 VA UPS, insert the
battery connector in the plug in the battery
compartment.
NOTE:
The plug is polarized and only will fit in one
way.
7. With the battery terminals toward the rear of the
unit, slide the battery (pack) into the UPS. Make
sure the battery wires retract without binding.
8. Close the battery access door and secure with the
(2) screws removed in step 2. Return the desktop
UPS to the upright position.
9. Dispose of the old battery pack according to
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