My Back-UPS shuts down after 15 minutes on battery power while there is enough back-up time remaining.

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Issue:
When utility power fails and the Back-UPS provides battery power, the Back-UPS shuts down unexpectedly after 15 minutes
even when there is enough backup time remaining.

Product Line:
All APC Back-UPS products with No-load Shutdown functionality.

Cause / Resolution:
APC Back-UPS products with No-load Shutdown functionality enabled will shut down while operating on battery power when
the attached load is less than 15 watts.

Please refer to the APC Back-UPS user guide for your model and check if the Back-UPS does have No-load Shutdown functionality.

Example:

No-load shutdown