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Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,
plus is the positive terminal (cathode) minus is the negative terminal (anode)
Polarity is the direction of flow of electrons throughout a circuit. There are two types of polarity: positive and negative. Postive polarity is of older circuits which means electrons flow from positive to negative. Negative polarity is of more modern circuits and that is the flow of electrons from negative to positive such as on car batteries
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Negative * positive = negative Positive * positive = positive Negative * negative = positive