“What is the normal battery life? Any way to tell if batteries should be replaced without removing case? MODEL bn 1500 m2”

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• Mine last about 20 minutes on no power. I think the recommend the battery be replaced every 3 years. You can run a self test with the software.

  Answered by SRWG 4 years ago

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• You should be able to get 2 - 3 years of use out of new batteries, but this depends on the environment they are in and how often it is stressed.

  Answered by AcedItAgain 4 years ago

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• Our battery lasted 7 years.

  Answered by Aaron 4 years ago

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