Why does it click off after being plugged in?

So a few months ago my iPod stopped working, it wouldn’t charge, so I replaced the battery, and then it worked for a few weeks. It stopped working again, so I gave up, but now I’m revisiting it. I put it in dfu mode to restore it, and now if I plug it into my mac, it continues to say charging… please wait. When I plug it into the wall it turns on fine, then clicks off! I’ll attach a video of it doing this. Anyone have any ideas of what’s going on?

https://youtu.be/IVtK3HG90FU