Thread: Don't throw away the batteries
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Jonathan Kamens Jonathan Kamens is offline
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Default Don't throw away the batteries
writes:
Batteries in smoke detectors do not get any use,

Yes, they do. Ionizing smoke detectors, the most common type, work by
generating a small current between in the ionized air between two
metal plates.

I agree with you that a good battery won't be drained by a smoke
detector in six months, but it's erroneous to claim that batteries in
smoke detectors don't get drained unless the detector goes off. Even
if the detector is never triggered, the battery will eventually
discharge, and not because it just wore out, but rather because it was
used up, slowly but surely.

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