Seeing all that empty internal space makes me wonder if they couldn't increase the device's appeal by fitting it with a bigger battery. 8-10 hours of charge time is good, but a $200 laptop that could go for (say) 20 or 30 hours on a charge would really turn heads. I suppose it's possible that would require some kind of custom battery, and this is just the most appropriate battery for this enclosure they could get off…
It's an 10,000 mAh battery, though. That's huge, isn't it? I don't know any other laptop that has a battery that big. Looking online, Macbooks seem to have around 6,000 mAh.
38Wh is fairly small for a laptop battery.