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What Happened To Duracell PowerCheck?
(hackaday.com)
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this post was submitted on 10 Oct 2024
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I do this with AAs. Basically put the side with the bump (positive) on the tip of the tongue and touch the flat (negative) side with a wet finger. It gives out a mild but distinctive 'taste', not enough to tingle but definitely something I am able to notice, when the cell has decent juice.