I have not had any problems with my batteries but it's good to know someone has already done the leg work to fix them if I do. Archive: https://archive.today/a5Lbh From the post: >>Some time ago, I had 3 of my new Ryobi batteries fail on me unexpectedly. That got me curious about what caused the failure. I went down a deep rabbit hole, buying dozens of broken batteries from eBay, reverse engineering the PCB and documenting my repair steps. In this post, I will share everything I have learned including a detailed repair guide to help you recover your batteries. One of the failure modes that cause my own batteries to fail was very interesting so I made a video detailing that. Here, I will go into more detail about that and about the other, more obvious failure modes.