Yeah, I was surprised to discover that my mains connected alarms had a sealed backup battery that is recharged by the mains, but deteriorates over time. Once it started beeping, it had to be chucked. Annoying and wasteful.
Not a DIY job for some people either. ££
@mashton started
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Yeah, I was surprised to discover that my mains connected alarms had a sealed backup battery that is recharged by the mains, but deteriorates over time. Once it started beeping, it had to be chucked. Annoying and wasteful.