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Do they make rechargeable 9 volt batteries?

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9V Rechargeable batteries (NiMH and Li-ion) "9V" is the physical size/shape, not the actual voltage. An alkaline 9V is really 9 volts, but a rechargeable "9V" battery is initially 9.6V, 8.4V, 7.4V, or 7.2V, depending on the model in question.

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