Re: The hidden danger of dead batteries...
Sure, maintenance is important, rather than letting them drain before doing anything with them. But a regular routine has certainly saved me a small fortune. I've been rotating the same 9v rechargeables in the smoke detectors for around 10 years.
I do treat them the same as my deep cycle batteries for mains backup, though, and it has served me very well.
Not a fan of NiCd, though.
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