NotMe wrote:

Given the cost we replace and trash (no gifting) @ 5 years.

Good advice. Never "gift" used detectors! Only re-use the batteries for
something else besides life-safety devices. Always use brand-new
batteries when replacing them, and check the detectors twice a year -
minimum. A good way to remember to check them is to do it when changing
the clocks twice a year.

--

I met a guy today who said he was addicted to brake fluid!
But he says he can stop anytime.