How many cells are within in a 24 volt lead-acid battery?

Correct Answer: Option A — twelve cells

Calculating the number of individual cells in a lead-acid battery requires dividing the total nominal voltage by the nominal cell voltage of 2 volts. For a 24-volt system, $24 / 2 = 12$ series-connected cells. 46 CFR Subchapter J outlines standards for emergency battery banks utilized in marine installations.