I noticed that you can buy a USB 3ds charger for only $10 on amazon, bit would that cause any issues? The official 3ds charger is only 4.6v at 900mah, but USB is 5v ranging from 500mah to 2000mah+. Does using 5v harm the system in any way? I want a USB charger for convince, but I also don't wanna break my ds.