I’m putting new smoke detectors in, and find it irritating that even with hard wiring they need batteries- can’t the have a big capacitor or a lithium coin cell for backup?
But anyway, smokes are supposed to last 10 years. Are there any batteries that last that long in one of them- we’re talking basically shelf life, correct:
Engergizer Ulimate: 20 year shelf life
Energizer Advanced: 12 year shelf life
Regular Alkaline- some say 10 year shelf life.
Whatabout all the Ultimates that my camera doesn’t think are good, but still test into the green on my tester?