I have a gas detector that runs on power and uses a 9v for batter backup. Unfortunately, where we have the unit can be bumped and will fall off the wall once a blue moon. It won't announce it's on battery until the batter is low, and it doesn't take more than half a day to kill the battery. I bought this rechargeable battery so that if it happens to drain, I'm not out a battery. It's already paid for itself.
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