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Testing Individual Cells of a Battery Pack

By 16/01/2013 June 4th, 2020 Battery Expert Q&A

The Question:

I have a battery pack that is not charging up to full capacity. I know the problem is one (or more) bad cells. What would be a good way to tell which of the cells are bad?

Red Scholefield replies:

Depending on the age of your battery pack I would be wary of just replacing one or two cells, kind of like replacing one or two spark plugs or tires. If it’s a fairly new pack that you suspect a cell has gone bad you can probe the sleeve with straight pins and measure each cell. Any cell reading over 1.0 volt is probably OK. Have you run a capacity check on the pack? If you pack is over 4 years old, replace it.