What would be the voltage of a leaded battery that has one shorted cell?

In a lead-acid battery, each cell typically has a nominal voltage of about 2 volts. If one cell is shorted, it effectively contributes 0 volts instead of 2 volts. Therefore, if the battery has multiple cells, the total voltage will be reduced by the voltage of the shorted cell; for example, in a 12-volt battery with 6 cells, the voltage would drop to around 10 volts.