If two 12v40 batteries are connected in parallel, what will be the output voltage and capacity?

When two batteries are connected in parallel, the voltage across the batteries remains the same as that of a single battery, while the capacities (amp-hours) add together.

In this case, each battery has a voltage of 12 volts and a capacity of 40 amp-hours (Ah). When the two batteries are connected in parallel, the output voltage is still 12 volts. However, since they are combined in parallel, their capacities are summed, resulting in a total capacity of 80 amp-hours (40Ah + 40Ah).

Therefore, the output configuration of the combined batteries is 12 volts with a total capacity of 80 amp-hours, represented as 12v80Ah. This matches the characteristics of batteries connected in parallel, where voltage remains constant while the capacity increases with each additional battery connected in parallel.