Powell,

I used 2 of the 5 sense boards per your wiring diagram. Each board has 3 wires to the charge board and +red & -black to 6 volts (5NiMH). 2 Li ion cell voltage seems to work fine instead of 5 NiMH.

My 18v tool batteries have a 6 pin header so I can check individual cell voltages from time to time. The sense boards got their power from a cable plugged into one of those headers.

All worked great.

Then I tested the bike, without connecting power to the sense boards. Everything still worked great! i concluded the boards weren't needed.......

Wrong.... the bike sat, batteries off, for 3 weeks. I mounted the batteries, turned on the bike, and got Error 1. I checked all connections, same error. I finally plugged in the red and black to the sense boards and the error is gone. All works great.


"Above my pay grade" just means I don't have the knowledge or experience to understand what is going on. If I had to guess, I some capacitor holds enough charge for a few days to prevent error 1. After that the sense boards needs some power.