The idea of using Heavy Duty Batteries with alkaline back-ups is interesting. Does anyone know which brands are true carbon vs alkaline batteries?. Does it say so on the battery cases?
Yes, the best ones say "super heavy duty" right on the package. That's a carbon-zinc-chloride chemistry.
Looking on Amazon, there are all sorts of brands like Eveready and Panasonic (probably all made in the same factory somewhere).
It might be best to try them in one of your lights and see if you get the performance you want.
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