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The voltage depends on how the two batteries are connected to one another. If they are connected in a series circuit (positive end to negative end) the voltage will double. If they are wired in a parallel circuit, (It

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Q: How does the voltage of a double battery compare to the voltage of a single battery?
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A 12V car battery has six cells connected end-to-end What is the voltage of a single cell?

Battery voltage / number of cells = cell voltage 12/6 = 2 volts cell voltage


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