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How do I know if it's the battery or the unit?

BillP
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How do I know if it's the battery or the unit?

This question was originally posted by Bernard on APC forums on 3/9/2021


Hello,

Yesterday everything was fine and today I woke up with a powered off NAS and no lights on the Back-UPS 650.
The NAS went off unexpectedly, no alarm or messages.
The Back-UPS won't turn on at all. Pressing the reset on the back has no reaction.
Before I go and buy a new battery I would like to know if the unit itself is working.
How can I make sure?