Pixl.js - dead? no surely not :-(

Sun 2020.09.27

'merrily monitoring voltage of 2x 12v Campervan batteries'
'I haven't cooked it I am convinced'
'I've checked the power leads'

While it isn't detailed, and the Pixl was running, just for confirmation as there could be many wiring variants, Is the board powered by just one 12V and not by both? ref: '2x 12v'

Some ideas: As the WebIDE shows green connected then amber dis-connected, Is there any additional detail shown in the WebIDE log?
WebIDE >> Settings >> Console

What PC OS is in use? I've had issues after flashing on Windows10 requiring closing, detaching, re-powering, re-pairing and re-launching the WebIDE.

Any chance a fresh CR2032 could be used to test away from the van?

Upload a simple .js test code snippet to illuminate the backlight.