Well I'm glad everything worked out.

Frank...don't get this one locked

Smoke detectors are cheap and once they start acting why would you bother fixing them. I've never had one last more than a few years and wouldn't want one in my house much older than that anyways. These people that spend $40 on one because it has a 10yr lithium battery in it... I just gotta laugh.
Go to the hardware store and pickup the contractor pack, enjoy the spares.
The only one I spend extra dough on is the one in the kithen, its gotta have a 'shut up' button.
<monoxide detectors are a whole different ballgame>