(Maybe) Building a new case for Bangle.js 2

Sadly this will always need disassembly of the original watch. There are 3 main points which are common to all my versions and were solved by soldering:

• USB charging -> Connect USB port to charging pads
  
• Other button -> Connect new button to mainboard
  
• Bigger battery -> Replace the original lithium cell
  
  

The button is actually soldered to a bit of flat flex cable taken from the backlight LEDs of a broken Bangle display.

I would say what I am doing has a very high risk of killing the donor bangle. Not quite sure if it is actually worth doing. It currently is more of an experiment just because I (maybe) can ;)

I have never designed flat flex cables, so maybe that would be a way to at least remove the most difficult parts of the soldering job, but currently it is definitely at the absolute limit of my abilities.

The design by @devsnd will get you the best way to get a more rugged Bangle. I will order one as well since my design is not close to be a daily driver.

As for progress:

• Everything can be mashed in the new case
  
• Button works
  
• HRM fits perfectly
  
• Bigger battery fits and charges via USB-C
  
• Flashlight dimly works (two LEDs driven directly by 3.3V from board because I do not have a matching value resistor and one LED burns out instantly)
  
• Not yet glued together
  
• No way this holds together in daily use, at least the solder joints will probably shake apart in a short time
  
  

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