Reparability flaws are now visible:

The micro USB daughter board is separate from the main board, which would be otherwise good, except that it is melted in with plastic, and the wires are soldered on.

Like the micro USB port, the small (3.7V, 680mAh, 2.52 Wh) battery is soldered on to the main board. By design, replacing the battery needs a soldering iron.

Setting flaws aside, a weight can be seen in the controller. It is on the right side of the controller pictured, and the left side when held. It can be lifted out without tools. The added weight is 25 grams, contributing 12.8% of the controllers weight (195g).