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This question already has an answer here:

Battery leaks was an issue in the 80s and 90s, and since quality and innovation is constantly improving, I thought battery leak might be slowly going away. But I found that even nowadays, name brand alkaline batteries still leak after a while, even if originally concealed in a tight package of the metal shell. Is it true that the chemical in an alkaline battery inherently expands in volume over time, and make the alkaline battery leak issue unavoidable?

also why does the alkaline expand in volume over time?

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merged by jonsca Mar 22 '14 at 3:28

This question was merged with Does the chemical in an alkaline battery make battery leaks unavoidable? because it is an exact duplicate of that question.