Yesterday the C5 went for its 'Maiden Voyage': a 20 km round trip and it did pretty well.
I managed an average speed of 16.8 km/h according to the 4 Euro bike computer from the 'Blokker'
Battery indicator dropped a single bar on the return trip but the top speed had dropped then to 18 km/h.
Some minor issues: the front wheel hub caps resonate annoyingly at lower speeds, they drag a bit to the tire.
The rear brake started to emit an annoying squeak along the trip, squeezing the brakehandle a bit stops it but when released the squeak comes back again after a few moments. Also when braking hard it makes very loud squeaking noises now.
I also might need the wider drivebelt, the new battery delivers so much power that the drivebelt skips when pressing the button at slower speeds. I already increased the belt tension some more but it still skips sometimes.
The LED lights I put in work OK, although the front light does not have a distinctive beam pattern on the street, it lit up the road well enough to see where I was going. The rear indicators work OK, still waiting for the front 'pods' to arrive: seems they got lost during transport from China...