In our effort to push out the heart sensor array, the whole bottom pops out. Turns out they weren't kidding about more access through the bottom case.

We spot a magnet in the middle for holding the Watch to the charger, the charging coil itself, and some new silicon:

A88 AY10

18206 00D5

That's a very tidy array of black pads lying under the S4 package—possibly for heat dissipation? Or maybe they are just comfy pillows for keeping its stress levels low.