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GProgrammer said:
The Ipad Air 2 has a 27 watt/hr battery
if the graphics chip used 90 watts you'ld get 15 minutes use before you had to recharge it, Is this what you want the NX portable to be? Only usable for 15 minutes! [smile]

The way I see it the chip has to consume 8-9 watts max in portable mode. 

Current X1 runs at bit too hot at 20 watts. However a die shrink to 16nm + improvements made by the Pascal architecture could bring that down into the range needed. 

Then Nintendo would need a large battery, the iPad Pro has a 38.8 wH battery ... that would give you almost 4 hours of battery life. 

It would be a huge battery, but on the positive side, batteries are actually quite cheap especially when purchased by vendors. You can buy 10,000 MaH batteries (which would give you about 40 wH) for $25 at retail, the actual cost of the battery is probably half that.