Not a full teardown; just board photos (both sides) and things that I couldn't find on the Internet easily.

Internal battery, 60Wh

Top assembly. Screen is attached to top case.

The two 2W speakers are quite large and sound fairly nice, surprisingly. Doesn't look like they're ported enclosures.

The copper heatsink is screwed onto the bottom cover. The CPU fan draws air through this area (not a lot though).

Copper heatsink with heat pads for the CPU and GPU voltage regulator MOSFET/inductors. During reassembly, make sure no wires cover the MOSFETs

Board Photos bottom side

Intel Core i7-6820HQ, DDR4 RAM, GTX980M can be seen here.