wireless earbud

So I decided to try to open and solder my headphones after identifying the area of the problem, but when I opened the cable, it was not what I expected. I thought there would be 2-3 insulated copper wires and the solder would be easy, but when I opened them I found this (images attached), a...

Image link: View: https://m.imgur.com/gallery/CjERGg8 Left airdot goes dim red light when placed in case compared to the bright red light in the right one and does not charge. Been using this airdots in more than a month and its been woking well until the issue suddenly arise. Did not drop...