Hi All,
More unusual symptoms to report. Took the C5 out and had a great ride out, long journey round trip. After returning, swapped the battery and the C5 ran even better. However, after another, shorter trip out, again the motor went completely dead. Again, I got full bars on the right, but just outer LEDs on the left plus the middle amber LED glowing slightly when I pushed the power button on the handlebars.
I left the C5 overnight. The next afternoon, I wheeled the C5 out (still would not start with a slight click, which I think came only from the handlebar switch). I decided to pedal only down the road and see if it ran again, as it did last time. No joy originally, but after maybe 400 yards the motor kicked into life again!
However, slightly different this time as there was a noticeable high-pitched whine from the motor / rear left wheel when I added power and for maybe half a second after letting off the power button.
When I got back onto my drive, the motor went dead again. Right hand display shows all LEDs lit. Left hand display again yellow LEDs only (outer ones plus the middle one when pushing the power button).
I haven't been brave enough to strip the motor apart, and am worried that maybe the gearbox is wearing out or seizing, etc.
Any other ideas what it may be?