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George Bredestege's avatar

A little bad news for you. Once a battery is in a smoke detector, it is connected and slowly being used up. The shelf life of a battery is its storage life. Once it is connected, the battery is discharging. Smoke detectors are checking their sensors every second, many times a second. The fact that the batteries last as long as they do is a testament to the electronics in the detector being extremely low drain. Thought you should know.

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Evil Harry's avatar

Shelf life doesn't mean that the battery will last longer in use.

That would be down to the mAh rating.

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