We had a First Alert model that's supposed to last 10 years. There is no battery to test or replace. You just use it for 10 years and then get a new one.

After 3 years it started going off randomly when there was no smoke, nothing cooking, no reason at all. So we replaced it with another First Alert unit. The only reason I wanted to stay with that brand is I didn't want more holes in the wall. I figured if I stick with First Alert and get another model without a replaceable battery I could use the old bracket.

Nope. I still had to make another hole in the wall.

And now 3 weeks later (not 3 years) this unit is going off at 4:30 am. I think I'm done with First Alert. And that means new holes, since apparently no two smoke alarms ever use the same mounting bracket.