Why won't my phone charge?

All of a sudden my phone won't hold a charge for barely anytime. And then when I plug it in for the most part it will if anything keep the charge at the percent it's at or will increase EXTREMELY slow. But the lightning bolt next to the battery is always on but usually doesn't do anything just is dying. This started outta nowhere and was working just fine right before this. Anybody know what's new going on? And can I do anything?
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Why won't my phone charge?
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