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ELI5: the harder I press the circles on a Duracell Powercheck battery I seem to get more power : r/explainlikeimfive
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voltage measurement - Duracell PowerCheck - How Does It Work? - Electrical Engineering Stack Exchange
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Duracell Coppertop Duralock MN1300-B2 D-cell 1.5V Alkaline Button Top Batteries (MN1300B2) - 2 Piece Retail Card
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