I modded my N3DS XL to add a USB Type-C charging port : r/3dshacks
Insten USB Charging Cable for Nintendo DSi / DSi LL XL / 2DS 3DS / 3DS LL XL / New 3DS XL - Walmart.com
New Nintendo 3DS XL USB charging connector
Buy Old Skool USB Charge Cable for Nintendo 3DS, 3DS XL, NEW 3DS XL, 2DS, DSi, DSi XL Online in Japan. B014VOLB12
Buy 3DS XL USB Charger Cable Kit, AC Power Adapter Charger Cable and Stylus Pen for Nintendo 3DS XL, Wall Travel Charger Power Cord Charging Cable Online in Greece. B08Y1K6QV9