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with an average of
2 charging methods are available:
5V 2A though any micro USB charger (so pretty much any micro USB charger).
As for USB type-c it supports 5V/3A,9V/2A,15V/2A,20V/1.5A so you could use an adaptor like this:
but as long as the USB-c adapter supports one of them it should work.
I use this one
It seems to charge as quickly as the oem psu
This looks like a great option for a Switch USB C charger [link] what do you think?
EDIT: It supports 15V 2A charging, but it also does many other voltage and amperage forms. Would it pick the most optimal for the switch?