FAA A&P Mechanics Practice Test

A 24-volt lead-acid battery typically contains six cells connected in series. Each lead-acid cell has a nominal voltage of about 2 volts, so when you connect six of these cells together, the total voltage adds up to 12 volts. Therefore, to achieve a 24-volt battery configuration, you would actually need two 12-volt lead-acid battery packs connected in series, resulting in a total of twelve cells (6 from each pack).

In essence, each of the six cells contributes to the battery's overall voltage, and when two sets of six cells are combined, they produce the desired 24 volts. This design is common in applications requiring higher voltages, assuring reliable performance in various mechanical and electrical systems.