Looks really great; from a technical point of view. Unfortunately it lacks the design features of the devices in the first posting.
Just kidding. 
Are those readings correct?
I.e. is the temperature accurate?
Well, now it just needs someone to design a cover for 3D printing, that makes the phone even look stylish.
I guess, judging from the picture of the yoga tablet in the first post, if a battery compartment like this could be placed on the side of the FP2 where the volume button is located.
Maybe this could even work as a stand to place the phone on a tabletop for watching videos, tv etc.?