I used to change batteries yearly, usually just after the 1st of the year, but changed to AS NEEDED (except for smoke alarm) after the prices for batteries went up to ridiculous levels. My go-to has always been Duracell and have only experienced one 'leakage' problem, and even that was more than 20 years ago. Energizer is my lithium choice, which I use only in my 'headlight' and WML. I keep spares on hand for all that I do use (AAA, AA, 9v, 123, and CR2032).
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