if car battery diagrams show electron flow from negative to positive, why are you able to charge a car battery by connecting to the positive terminal only? Shouldn’t we be adding “potential energy” back into the negative side?

Question

if car battery diagrams show electron flow from negative to positive, why are you able to charge a car battery by connecting to the positive terminal only? Shouldn’t we be adding “potential energy” back into the negative side?

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Answer 1

The negative terminal is wired to the frame of the car. As long as you connect the black lead to something metal (that’s not the red positive terminal) it’s the same as connecting it to the black.