APC Battery Charger RBC18 User Manual

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C. What happens when the replace battery LED does not clear?
If the self test fails:
■ If the battery capacity is greater than 75%, turn the unit off and restart it. When you turn a Smart-
UPS on, it will initiate a self-test. After the test completes, the LED should clear.
■ If the unit fails the self-test again, contact APC Customer Support (email: support.apcc.com or
phone: 800-800-4APC).
V. Increasing ‘Runtime Remaining’ of the Smart-UPS as viewed through Powerchute
PLUS or SmartSlot Accessory and prevent premature Low Battery Signal
Discharging and recharging a Smart-UPS resets the microprocessor to properly read battery voltage.
An accurate measurement is important when calculating the runtime remaining value appearing in
Powerchute PLUS or SmartSlot Accessory.
A. Initiating a runtime calibration
The runtime calibration option is accessible using Powerchute PLUS software or an APC SmartSlot
Accessory. Once the battery capacity reaches 100%, select this option. The unit will run on battery until
battery capacity is 25%. At that point, the unit will return to utility power and begin recharging itself. If
the runtime as seen through Powerchute PLUS or SmartSlot Accessory does not increase, then follow
the instructions in the next section.
Note: APC recommends that a runtime calibration be initiated once every
six months at a maximum.
B. Disconnect from utility
By disconnecting the UPS from utility, a premature low battery signal can be prevented. It is recom-
mended that the power to the circuit be turned off at the distribution panel. Unplugging the Smart-UPS
from the outlet is not recommended.
Note: The Smart-UPS will run on battery until it discharges completely, turning off the load. It is not
necessary to discharge completely. Power can be restored to the unit once it reaches low battery
condition(see owner’s manual for details on how to identify low battery condition).
If experiencing low runtime or premature low battery signal issues, contact APC Customer Support
(email: support.apcc.com or phone: 800-800-4APC).

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