I just found external charger kit for old3ds (may be for n3ds too) but it out of stock already.
new3ds has an external charger and where to order it?
External charger kit like this item.
nintendo-3ds-power-battery-charging-kit-with-cable-6-in-1
new3ds has an external charger and where to order it?
External charger kit like this item.
nintendo-3ds-power-battery-charging-kit-with-cable-6-in-1