What's Inside a Dewalt 60v Battery That Won't Charge

For some reason I have a Dewalt 60v battery that doesn't like to charge properly. Started out claiming it was fully charge but then when I would go to use it, it would die instantly. So what do you do? Take it apart of course and see what there is to see! We found as I suspected one cell is completely out. Unfortunately getting the cell out looks like it would be a lot of work and Dewalt appears to offer a warranty so, going to try that first instead.
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