Consider how the "Dry Cell" works, you have a metal case, an electrolytic "Gel" (or slurry) in the case and a rod of some material in the middle (The positive terminal).
As the battery discharges the electrolytic "Eats" away at the shell, it's the chemical reaction between them that generates the power. So the good battery has a nice THICK shell, but the bad battery, it's paper thin.
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