Milwaukee M12 6Ah Battery Not Working? Fixing Cell Imbalance

In this video, I diagnose and repair a Milwaukee M12 6Ah battery that’s not working properly due to a cell imbalance issue.

After opening the pack and checking the 18650 Samsung 30Q cells, I found that three banks of two cells each were reading significantly different voltages—a clear sign of imbalance. This is a common cause of power issues and charging failures in lithium-ion tool batteries.

What You’ll Learn:
✅ How to safely open and inspect a Milwaukee M12 battery
✅ How to identify cell imbalance with a multimeter
✅ What causes cell imbalance and how it affects performance
✅ How to correct the imbalance using proper tools and techniques
✅ Tips to extend the life of your lithium-ion tool batteries
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Whether you're a DIY repair enthusiast or just want to save a battery from the bin, this guide shows you how to restore performance without replacing the entire pack.

⚠️ Safety Disclaimer:
Lithium-ion batteries can be dangerous if mishandled. This video is for educational purposes only. Do not attempt repairs unless you're trained and take all proper precautions. Always wear safety gear and work in a well-ventilated area.

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