Chosen Solution
My 3ds Xl will not charge. The charging light comes on but the battery does not charge. I have checked the fuses and they are good.
First try a new adapter . My son had 2 Adapters that went bad and this same issue happened. Next i would replace the battery. If this doesn’t solve the issue then your looking at a problem with the charging circuit.
For my problem are the same also,, it only can play while in AC but not in battery .