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Author Message   Mr_flibble Tinkerer Username: Mr_flibble Post Number: 120 Registered: 10-2011 Rating: N/A Votes: 0 Posted on Thursday, August 08, 2013 - 06:46 am:    You can start by gently rubbing those two small metal contacts with the wires attached to them to clean off any visible oxidation. Carefully rub with a fine emery cloth if the oxidation is more extensive. You can safely clean with q-tips and cleaning alcohol as the alcohol dries without leaving a mark. Clean the two silvery contacts on the cell only if they are oxidized. If you damage the cell's external coating it will degrade rapidly.