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When I plugged in the USB cable, Lenny displayed the battery level of the UPS. However, it says it's running on battery power and discharging, even though it's plugged in.
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Then something isn't configured properly.
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I really don't want to test to see whether Lenny will shut down gracefully when the battery discharges, but I'd rather not install the software if I don't need it.
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If you don't test it, then you won't know if it works or not, until it is too late
The UPS is there to keep your PC running for long enough to shutdown gracefully in the event of a power failure. When properly configured it could warn your users "There's a power failure, this system will shut down in 3 minutes. Please save your work and log off NOW".
Make a backup. Test what happens when the UPS battery fails.
Otherwise there's absolutely no point in having it and you have wasted your money.