[akshed]

The images show very tight clearances around the battery (0.1mm is the thickness of a human hair) in plan view (XY). The footnote explains discusses the lack of "ceiling space" for the battery to expand into, which mostly happens in Z (the thickness of the phone). In Z, the design is line-to-line.

[keville]

To a machinist, a tenth of a millimeter is a yawning gulf.