From the User Manual:
“OVERLOAD/CHECK BATTERY” LED: this red LED lights continuously after a self-test to
indicate the capacity of the battery-supported outlets has been exceeded. To clear the overload, unplug some of your equipment from the battery-supported outlets; then use the ON/OFF/TEST button to run a Self-Test. If the UPS continues to detect an overload, remove more equipment and repeat the self test until successful.
CAUTION! Any overload that is not corrected by the user immediately following a self-test may cause the UPS to shut down and cease supplying output power in the event of a blackout or brownout.
The LED flashes to indicate the battery needs to be recharged or replaced. If the LED flashes (and a continuous alarm sounds) during a prolonged blackout or brownout, the UPS’s batteries are nearly out of power; you should save files and shut down your equipment immediately.
If the LED flashes following a UPS self-test (after the UPS is turned ON), it may indicate that the battery needs to be replaced. Allow the UPS to recharge continuously for 12 hours; then use the ON/OFF/TEST button to run a Self Test.
If the LED continues to flash, contact Tripp Lite for service. Should your UPS require battery replacement, visit Tripp Lite on the web at
www.tripplite.com/support/battery/index.cfm to locate the specific replacement battery for your UPS.
Hope this helps!
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