Here’s my favorite photo from the week:
That would be why I test every detector. Brand new still wrapped Amazon basics battery, installed backwards, door closed, mounted on the wall. On the bright side, no “low battery” beep, problem solved.
For more see also favorite inspection photo and especially https://d12m281ylf13f0.cloudfront.net/bbsystem-usrimages/C/CircuitBreakerLabeling.jpg "Seller, by the way, was proud that "I did all the work myself.