Can you fly with stuff like this? I only wonder because of the battery setup. Very cool, I would personally use a regular track pad over the ball as I prefer as little mouse interaction as possible and it would stay out of the way better.

Off the shelf LiFePo4 18650, marked capacity - not at all sketchy. 8 cells are way below the carry-on limit of 100 Wh.

Have multiple times no problems.