Fenton S1000A User Manual page 7

Introduction
Features of Line-interactive UPS
* Real Time Warning For Failed Battery -
(LCD Model)
The battery self-test function of the UPS will check battery
status every 20 minutes (no need to push the button by user).
The "Battery Replacement" symbol on LCD panel will show up
when battery failed or is in open circuit, simultaneously the
word "Battery Bad" will be displayed in the main screen of the
monitoring software.
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