From what I can recall of high-school chemistry, it depends on which ions are being used, and generally different for each combination. The basic zinc-manganese

From what I can recall of high-school chemistry, it depends on which ions are being used, and generally different for each combination. The basic zinc-manganese dioxide cell has an EMF of about 1.5V, while lead-acid car battery cells give about 2V. https://www.pveducation.org/pvcdrom/battery-characteristics/battery-voltage https://www.pveducation.org/pvcdrom/battery-characteristics/... https://www.pveducation.org/pvcdrom/battery-basics/electrochemical-potential https://www.pveducation.org/pvcdrom/battery-basics/electroch... Update: I see it also depends on their concentration, so the voltage changes as the cell discharges, unless all the components are solids: https://www.pveducation.org/pvcdrom/battery-basics/nernst-equation https://www.pveducation.org/pvcdrom/battery-basics/nernst-eq...