How many volts would a battery with a dead cell show?

Question

I read that a battery with a dead cell would not charge above 10.5 volts?  However if each cell is 2 volts wouldn’t it be more correct to say a battery with a dead cell will charge up to anything between 10 and 11.9 volts?

Pᴀᴜʟsᴛᴇʀ2 · Accepted Answer

Typically, a battery with a dead cell, when fully charged will show the 12.5+vdc as you'd expect. However, once you put it under any type of heavy load (ie: trying to start the vehicle), the voltage will drop down to ~10.5vdc. There is usually a small amount of charge in the cell at first, but is soon wiped out after the battery is put to the test.

Correct answer by Pᴀᴜʟsᴛᴇʀ2 on May 10, 2021

How many volts would a battery with a dead cell show?

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