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Batteries got good enough and electronics efficient enough that for a doorbell it makes more sense to use a battery than to run a dedicated 12v wire.
My dumb doorbell has a little coin battery.
4 points
My doorbell generates the necessary electricity when someone pushes the button.
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I couldn’t be bothered to regulary take down my doorbell to charge it. I’d probably tell people to just text me, when they’re at the door.
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