keymastr wrote:
If your smoke alarms are 10 years old just replace them. They have a 10 year life span. New ones have 10 year batteries so when battery needs replacing you simply replace the whole thing. Nice not having to listen to it chirp every few months when the battery gets low.
Not all new smoke detectors have a lifetime battery, although some do. The packages, of course, say what power is needed. (Many also are intended for hardwire installation and those use 120V power with a battery backup.)
I replaced the old smoke detector in my motorhome (and indeed the old, nonfunctional, disconnected by the previous owner CO detector) with combo smoke/CO detectors. As they were at opposite ends of the RV, I figured it wasn't a terrible idea to detect both dangers in both places. The smoke detector part, at least, works plenty effectively at finding miniscule amounts of smoke from cooking. ;)