First Alert smoke alarms were designed by a cretin. It is nearly impossible to extract an old 9V battery. One has to pry it out using a knife, and the fit is so tight that it is possible to destroy the battery or the alarm in the process. After one connects the battery, the alarm emits a shrill scream that could trigger a heart attack.
A handy device for consumers would be a portable database with blacklisted manufacturers, so that one knows which brands to avoid. First Alert is a brand to avoid at all costs. If another smoke alarm costs three times as much, purchase it. At least the other manufacturer may have given some thought to the issue of battery replacement.
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