5V PSU connected to charger module: 2 wires
5V PSU connected to control module: 2 wires (*)
Charger module connected to battery: 2 wires
Battery connected to LED strip: 2 wires
Battery connected to DMM: 2 wires
Battery connected to voltage sense pin on control module: 1 wire
Battery connected to 5V PSU GND: 1 wire
Control module connected to LED strip: 2 wires
Anyone for a plate of spaghetti?
(*) Boost circuit needs a resistor replaced … a resistor I haven’t ordered yet. 
Once replaced, those two wires go from the charger module to the control module.
Yeah, it took me five days to get to that last night. After I built the control module I couldn’t get it to boot up. Voltages checked out, all connections made, yet it wouldn’t enumerate nor could I read the device ID. After some poking and prodding I discovered that I completely overlooked the HWB pin which controls what it does on bootup, but even then it should’ve still worked and give me a reading. The other thing I also didn’t do was add any kind of indicator LEDs on it. So I decided to punt the design and started working on revision 2. It wasn’t till I had that new revision in 3D space last night to adjust the sabot enclosure that something caught my eye: the crystal pads. The wrong pins were getting grounded. Turns out the original land pattern which I copied long ago from a different library weren’t flipped properly. They’re designed from a bottom view instead of top view. A little bit of hot air to remove the crystal, rotate it 90 degrees, then hot air it back in place and TADA! Now the real testing can begin! I already ran some stuff on it last night. Woo!
That whole top vs bottom view problem got me when trying to wire up a USB connector. Grrr.