Your lap cooking. They generate enough to noticeably heat a room.

Battery life

The comment I'm replying to appears to be talking about power DELIVERY, not consumption. Why would extra power-delivery capacity be intolerable?

The DGX Spark doesn't have a battery. If it comes with 200W delivery (actually 240W), it's because it plans on consuming close to that amount.

Although I'm kinda surprised the DGX Spark used USB-C at all for power instead of just like a DC jack or whatever. But whatever.

Thanks for the info. The use of the term "delivery" doesn't seem to make sense in this context, but OK.