You should make the video unlisted instead of private so we can see it if you don't want it to show up on normal youtube. But what happens when you plug in the power cord? Does it charge like normal? Does it do something different? Because in my experience when I turn on the solo and I get a solid red charge light but doesn't heat that means the battery is totally worn out.
Sorry if you already addressed some of those q's in your video, but make it so we can watch it
Fixed the video.
Here is a video of me plugging the power cord into the unit: