@Bart eBay, Amazon, AliExpress, Wish, and Craigslist don't have any quality control over what's sold. The phrase I often use in my shop when I hear someone bought their battery off of eBay is "the price is so nice, you have to buy it twice." Because the first one typically fails. I would try another battery and see if that fixes it. If you still have the toolkit, then order a battery from a reputable supplier like Mobile Sentrix, Injured Gadgets, or Mobile Defenders. Those are the top 3 parts suppliers, Sentrix being my favorite because they offer higher capacity batteries for $1-$3 more than the standard capacity.