Correct answer
Positive terminals together and negative terminals together.
Connect positive to positive and negative to negative, maintaining a nominal 12 V. Parallel connection adds the nominal Ah capacities of compatible batteries; it does not guarantee double starting current or actual operating time in every condition. Two 12 V batteries can also be connected in series for a 24 V system, so their number alone does not determine the connection. Follow the manufacturer’s wiring diagram, protection and specifications.
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Positive terminals together and negative terminals together.
One battery’s positive to the other’s negative, as a series connection.
Only the negative terminals together, leaving the positives disconnected from the system.
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