Old account, my new username is @fanfan54
Quick charging needs working data pins on both the micro USB port and the cable plug. Check your cable, and it should work!
This phone is compatible with Qualcomm Quick Charge 1, 2 and 3
Interestingly, the IR port was used for communicating with additional devices, add-ons to the 3DS, with a reasonable transfer speed:
- the Circle Pad Pro which adds a right circle pad in compatible games, like Smash Bros or Kid Icarus : Uprising
- the external Amiibo NFC reader/writer, that adds this feature which is build into the New 3DS