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| p.1 #5 · Speedlight suffering from battery corrosion |
If it's only the battery contact pads that are bad, then clean them with a corrosion remover, then with alcohol, and add a VERY thin layer of contact paste. Put a pinhead-size dab of contact grease on a paper towel and rub the contacts with it. The grease will seal and protect against corrosion while improving contact.
Having a chemical corrosion remove on hand is generally not a bad thing, as it can be used to clean all sorts of contacts - SD cards, lenses, etc. I use Deoxit. Never EVER spray it onto a camera or lens though, ALWAYS put it on a pad and use the pad to clean, then clean off any residue with alcohol. (This may seem obvious, but it's better to point out the obvious than have some poor sap actually do it.)