Comment by criemen
12 hours ago
> In addition to things like battery-backed smoke detectors in every bedroom, etc, which need periodic 9V replacements on a schedule.
Just as aside, lithium-battery powered smoke detectors are a godsend. The battery lifespan lasts the recommended life span of the detector, i.e. around 10 years. No battery replacements needed, although you still ought to test them once in a while.
In Scotland, building regulations now mandate sealed-in lithium batteries (and interlinking) on fire alarms. Which is annoying, given most smart systems still have replaceable batteries.