I’m not trying to be contrary, but who uses anywhere near the number of charge cycles (200-500) quoted for most rechargeables? I’d be very surprised to find that I own a battery that has had 100 charges in the past 10 years or so.
I get it that someone who’s work requires inspections, but do these folks drain and fully charge their cells daily? My EDC gets 2-3 months of use per charge and that is my most used battery. (18650) If I were to ever need to get say, 250 charges out of a $6-$8 battery, I’d consider that money well spent.
I like fresh inventory on most consumables in most categories, and rechargeables are no exception.
So around 100 +/- charges per year? If your battery costs $10-$12 and you get 300 charges (3 Years) out of it, $3-$4 a year? Probably not breaking the bank.