Correct answer
One battery’s positive terminal to the other’s negative terminal: series connection.
A series connection: connect one battery’s positive terminal to the other’s negative terminal, leaving the two free terminals as the ends of the bank. Nominal voltages add: 12 V + 12 V = 24 V. With these identical batteries, connecting them in series does not double nominal capacity in Ah. Installation must follow the manufacturer’s wiring diagram and specifications; do not improvise connections to earth or other supplies.
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One battery’s positive terminal to the other’s negative terminal: series connection.
Directly connecting each battery’s own positive and negative terminals together.
Both negatives together and both positives together: parallel connection.
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