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This one is good enough and has 12v USB-C/with PD support. [link]
Probably what I am getting myself too. Glad I didn't bought a new powerbank.
[link] is the one I purchased. It was on sale for about $50.
Other, cheaper batteries work too. They just charge a bit slower and/or have lower capacity. This one about the same size as a 3DS XL, but a bit thicker and a lot heavier.
This Aukey 30,000 mAh battery pack with power delivery and usb-c is on sale today for only $54 (normally $80) with code AUPOWER1
I don't have one personally but reviews are good and it looks like it should be able to charge the switch while playing and should have 5-6 charges. Been considering if I need a battery pack, so I've been mulling this one over today.
Yeah I'm wondering if the Amazon listing has the wrong number in it.
That's what I'm looking at so I dunno anymore.
Aukey - 30,000mAh with 30W PD. More than enough to charge a Pixel 2 plus it has a handy led flashlight on it that lasts forever.
This USB-C Port charges at 14.5V/2A
And this is the one with usb 3 quick charge etc.
Heres an amazon.com link