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Message: <blockquote data-quote="nickt" data-source="post: 343678" data-attributes="member: 4923">Corrosion could have crept deeper like HS said and caused a connection inside to fail. But I would say try harder to clean it. See if you can get some fine sandpaper in there and really clean the contact. Maybe tape it to a stick to get down in there. I've seen contacts that look clean, but still have a thin coating of insulating corrosion on them. Roughing them up a bit often helps. If you don't have sandpaper, try a pencil eraser, but that corrosion layer can be tough stuff and I have good luck with the sandpaper. I've also scraped with a small screwdriver. An emery board nail file bent at the end can work too.I hate alkaline batteries in high drain devices. That seems to be the recipe for leakage... run batteries down a bit at a high rate, then store for several months. Consider eneloop rechargables next time.</blockquote>