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Which AA batteries have button cell batteries in them?

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Commercial AA cells won't contain button cells, because AA cells are a single cell (1.5V nominal, based on alkaline chemistry). read more

There is very little market for a AA-sized multi-cell battery; 8 LR44 cells would stack up to make a 12V battery, but there is already an A23 12V standard battery that fills this niche; wiring 8 LR44 cells in parallel would make a 1.5V multi-cell battery that is the same size as a AA-cell, but would have lower power capacity and be much more expensive to manufacture. read more

Replacing a mercury button cell, which may be found in older photography equipment, with a silver oxide battery will affect the light meter settings, requiring them to be recalibrated. Mercury batteries, which are no longer produced, operated at 1.35 volts, compared to silver oxide's 1.5 volt discharge. read more

As I've browsed the internets I've come across several videos of people cutting open AA batteries and extracting 6ish much smaller button sized batteries. read more

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