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Actually two layman's cells would amount up to 80 mah. Now the ratio of minutes to mah is 9/10. So for Every 10 mah, you'd get 9 min if fully charged. So, using ratios, 9/10 and ?/80, divide 80 by 10 to get 8 and multiply 8 by 99 (edit: I mean 9) to get 72 min total runtime. Now, 36 min would be the FULL runtime of a layman's dual cell.
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