I just finished my first build on a Jamis Commuter with an 8 spd rear hub. I used mostly BMS Battery components (36v bottle battery and a Q100 328 rpm front hub motor driving 700c wheels. The BMS controller (KU65) turned out to be a dud and I replaced it with an inexpensive Greentime controller. The bike runs great producing an unassisted 22mph on level ground. When I discarded the KU65, the battery meter went with it. Now I need a way to determine how much charge is left in the battery when I'm out riding. I'm not looking for a fancy analyzer just something to keep track of my remaining "fuel". Ideas, sources?