Power Tool Batteries: M12, M18, MX FUEL, Power Supplies | Milwaukee Tool

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Troubleshooting a Milwaukee M12 Battery Part 2! I found that this battery most likely has a bad cell. These M12 6.0 ah batteries have a history of failing because they have more batteries and cells that can fail. M12 batteries have 3 cells and all 3 cells should be roughly around the same voltage and drain equally. A fully charge battery is some where around 12 volts - and each cell should be around 4 volts. Well this battery has one cell that remains at 4.2 volts and doesn’t drain. I’m hoping I