would a usb extension cable work with a ps4?

Yes it will work, but 20m? lol

Just charge it with a phone charger next to where you sit if you are worried about it dying on you mid game
 
I have one of those anker 5 port USB chargers on the table next to the couch, use it for my phone/iPad mainly but the other ports I use for controller, vita and 3DS. It's a great wee thing and was quite cheap if I remember right.
 
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