Everyone is recommending a better charger. I use the Anker Quick Charge 3.0 60W 6-Port USB Wall Charger. I have the PowerCore II 20100 and PowerCore+ 26800. Both charge in just a couple of hours (8-9) so definetly take a look at your charger.
Best way to charge an Anker product?
Well , I make a very (very !) rough calculation:
20 amps loaded in 48 hours. To make it more easy: in 40 hours. 20 divided by 40 gives 0,5
So let me guess: your loader provides max. 500 mA - which is 0,5 A
So: use a more powerful loader. Lets say: 1 A loader:
Then the (very rough calculation) is 20 Amps/hour (which is the same as 20.000 mAmps/hour) divided by 1 amp is 20 hours , you see: you have cut the time by half. But please note: this calculation is very rough , but gives you the direction in which you have to go.
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An addendum to my very rough calculation: you have to add some time, because on most chargers the amps go down while the battery becomes full - as mentioned here before …
i just use a first party nintendo switch adapter