There could be a few issues.
-Batteries typically wear out after a couple years and needs replacement.
-You can purchase a USB amp meter to test if it takes any current. It should take roughly .50 amps when charging. Here’s one I use https://www.amazon.com/Soondar-Charging-...
-It could also be an issue with TriStar. TriStar is a USB validator. It basically checks if the accessory you plug in is apple certified. The cheap “fake” chargers available lack proper surge protection and if there’s a sudden power surge, TriStar can get damaged. It’s noticeable when the battery completely dies as it will say it’s taking a charge, even when hooked up to a USB amp meter, but never actually charges. There is a tool available to test it but it costs roughly $150. A local repair shop may have one on hand.
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