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Use free solar power to bring new life to the following button batteries: Alkaline, Mercury, NiCad, NiMH and Zinc-Air (1.2 - 1.5 volt). Not recommended for Silver-Oxide. A safe way to recharge batteries found in hearing aids, calculators, watches, hand held games, etc. Recharges one button battery at a time. US PAT No. 4,539,516