Why wont my XB950N1 Headphones Charge?

Why wont my XB950N1 Headphones Charge?
I bought them off eBay a while back and they worked for a while. Then the battery stopped taking a charge. Some work was done on them to see if a circuit board or wire was bad and that made them work again. But then a few days later they stopped working and will yet again not take a charge. Is it a button/wire issue or do i need to buy a replacement battery for them?

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