My Leaf-powered VX-1 has been virtually trouble-free, until this Spring. First I noticed that the clock was off by about three hours. I reset that after my first ride, and thought I was good. I just wasn't paying attention... My second ride was very pleasant: I charged to about 15 bars because I knew I'd only be riding about 30 miles, and the ride itself was fine. As I was heading home, though, and with 4 charge bars still showing on the gauge, the bike went into a greatly reduced power mode. At first I thought that the controller was hot, but there was no sign of that, and no warning lights. Then I looked - finally! - closely at the voltage display. I usually watch it, but this Spring I've been preoccupied, and the weather was so beautiful that I wasn't watching the instruments much at all...anyway, the voltage was at about 114 volts, instead of the usual 133-142. Finally, I realized that I was low on charge and the gauge was wrong. I limped to a local firehouse, where I was very lucky to be allowed to charge for 35 minutes before riding the last 9 miles or so home. The total ride distance was only about 27.5 miles, but without that charge I would barely have managed 20 miles. I immediately charged it back up to about 138 volts, letting the pack cool before charging it a bit more the next day.
So, given the clock glitch and the lack of warning lights, any ideas? The bike was stored this Winter with something like 12 bars showing, in a garage that only rarely, briefly got below 32F. My plan, when I get the time, is to fully charge the bike and let it equalize, then measure the cell voltages through the balance leads after a brisk ride. Is this more likely to be a weak or low cell in the pack, a firmware issue, or something else...?