Weirdly enough it is the unused Duracell batteries that show the first signs of corrosion. The unused homebrand ones are all fine.
Also, I need to buy new batteries.
@trinsec Duracell Industrial batteries are good in flashlights. They might also be called Procell batteries. They do cost more but I haven't had any issues with them. They kinda need to be reliable to be marketed for industrial use.
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@AmpBenzScientist Yeah, I mostly use them for remotes and trackballs. So industrial would be overkill. I generally have to replace the batteries every half year.
I'll just buy the cheap supermarket brand instead, they're not too bad for light use like this.
@trinsec Zinc Carbon batteries are good for low power drain applications.