Switch: 2.7 to 6.4 W on portable mode. Less than 39W on dock.

[Conina]

jonathanalis said:

Seems pretty obvious, but I have not seen anywhere.

Easy calculations. 4310 mAh bateries(from specifications on Nintendo site), at (suposely) 5V, give us 21,5 Wh. 

Nintendo said 2.5 to 6 hours, this leads to near to 3.5 to 8.5 W.

I expect ~3.8 V in such a form factor.

Nvidia Shield tablet K1 has 3.8 V (5100 mAh, 19.38 Wh), iPad Mini 4 has 3.82 V (5124 mAh, 19.32 Wh), PSVita has 3.7 V.

So I expect 3.8 x 4310 mAh = 16.4 Wh, this leads to 2.7 - 6.5 W in portable mode and probably around 20 W in docked mode.