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Comment on The R47: A new physical RPN calculatorparent

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You'd need two AAs or AAAs for a CR2032's voltage. While it would last a lot longer, it's also a lot more volume. Also, the diameter is going to be a problem for many calculators; e.g., the R47 being discussed here is 12mm thick, a AA has a 14.5mm diameter and a AA has a 10.5mm diameter.

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