Over time I have owned 3 Beats X Bluetooth headphones where the battery has gone bad. I watch the you tube video and thought that while not an easy replacement it wasn’t beyond my capabilities. I bought 3 replacement batteries. The disassembly wasn’t bad but trying to get the new batteries to work has proved to be an exercise in futility. The soldering is very fiddly. I got one set to light up but it still won’t work. I suspect user error on my part. I’m sure the batteries work well and they were delivered as advertised, it’s clearly that the replacement is beyond my capabilities. I would only advise someone skilled in working with small electronics to attempt the replacement. I wish there was someone I could pay to do it for me, although the associated costs likely make this uneconomic.