“Re: APC BN450M My battery backup has sat unplugged for at least 4-5 hrs. How does one know if it still functions properly?”

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• Try shutting down the circuit at the breaker, it should come on to show it's functioning.

  Answered by MillerTyme 1 year ago

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• By the light and you can hear it power up

  Answered by BrendaF 2 years ago

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