If two 12v40 batteries are connected in parallel, what is their output?

When two batteries are connected in parallel, the voltage remains the same as that of a single battery, while the capacity (measured in ampere-hours, Ah) adds together. In this scenario, both batteries are rated at 12 volts and 40 ampere-hours (Ah).

Since the batteries are connected in parallel, the output voltage will still be 12 volts. However, when it comes to capacity, the two 40 Ah batteries combine to provide a total of 80 Ah. Therefore, the output of this parallel configuration is indeed 12 volts and 80 ampere-hours.

This means that the appropriate answer reflects the combined capacity and the unchanged voltage, resulting in a total output of 12V and 80Ah.