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I thought that the reason for recommending alkaline batteries in smoke detectors over lithium was the power decay curves. Alkaline run down slower, giving time for the smoke detector to beep and warn you to change batteries, whereas lithium batteries are strong until they're nearly shot, then run down quickly meaning they may only beep a couple hours (while you're gone, maybe).

My husband wanted me to buy lithium batteries for the smoke detector. I didn't because I didn't find them. It likely makes a difference whether or not the battery is backup only or the battery is the only power supply.

Ours are hard wired to power which was required when we remodeled. I can attest to the fact that they weren't limited to a couple of hours of beeping. They are also interconnected which was really annoying when one unit failed at 2 am.
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