How often to change batteries in electric powered smoke detectors?
"Joe J" wrote:
No manual, just wondering how long they last when they are AC wired? I know
battery only, they recommend once or twice a year, but what about AC
powered? I would think several years, no?
If you are using standard alkaline, once a year unless you like getting woken up
at 3AM on a random day. Once every 10 years if you buy 9v lithium.
|