Leaderboard

BTW, there's a LED on the UPS board that lights up when it's powered by batteries. This will slowly drain the batteries, so I removed it.

Soooo, six months later... The board works perfectly. Powered through the USB-C port or via 1 or 2 18650 batteries it outputs 9V to the battery wires. I also connected a 9V to 5V converter after the UPS board, which feeds power to the halo light on the start/stop button (a digital switch was already installed when I bought it) and the bluetooth board. The bluetooth board is controlled by a flipflop switch, the button for it has a halo light connected after the flipflop switch, so it light up when the bluetooth board is powered. It' all working fine, except for a quite a bit of interference from the bluetooth board. So I need to sort that out.