I would do a double or treble "Like" on this post if I could. It used to be (or so it seems to me) that only the cheap batteries leak, but I have come to the conclusion that they all leak, even the "good" ones. I take the batteries out of anything I care about (but never a flashlight...you never know when you are going to need one).The batteries are not extremely costly, the corrosion when they die is where the trouble comes in. The crud gets layered on the contacts and then, the stuff cracks off and can get down in the mechanics. Just make sure if you try cleaning the contacts, clean so the flakes or scuzz falls OUT of the battery chamber.
Hey, it’s a watchmaker thing, what can I say? I worked with a very fastidious German watchmaker for several years.