I've tried countless batteries in my smoke/CO2 kidde alarms after the supplied "power supply" batteries were empty. Literally after 18 hours, he kept complaining about the low battery. Energizer, Rechargeables, Duracell, etc all had issues. You MUST buy those special AA batteries. In the end I just gave up and replaced them all with 10 year old Kiddes "No Problem" batteries because buying these specialty batteries is expensive, annoying, wasteful and pointless.
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