ATPL Forum – Personal Section Practice Test

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.