I came across my Garmin GPS while cleaning out my range bag. A light went off in my head. I had replaced the alkaline batteries 4-5 months ago but 2 months ago I noticed that the batch of Costco batteries I had were starting to leak. I swapped them out for duracells bought this year but I missed the GPS. This mess happened in just a couple months. I scraped out what I could and neutralized with vinegar then distilled water. It took the plating off part of a contact. I've had a couple items destroyed, glad I caught this one. If they swell inside a tube type battery holder there's no getting them out.