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Topic: Can I use two 9V batteries in series to power an Arduino Uno? (Read 19387 times) previous topic - next topic


one cell pushes current into the other. A bad thing, which shortens the life of the cell having current forced into it,

What makes you think it is a bad thing or shortens the life of the cell?  Most alkaline cells are at least partially rechargeable, some are indeed sold as such.

In fact, to actually charge a partially discharged alkaline, you need a substantially higher voltage.

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