New 3DS Won’t Properly Charge

So I've had a New 3DS XL since 2015 but it has an big issue. Whenever I charge the system, it will charge normally but after a few seconds it will stop and the system will claim it's "fully charged" (blue battery icon) when ofc it's not.

I've tried replacing the battery but the issue still remained. Can anyone possibly pin down the source of the problem?