I'm just starting my second week. I've got an odometer now and find I am actually travelling 48 kms a day. The NiCads get a bit hot if I use them a lot, such as when I have steep hills AND a head wind.
If I was going to start this whole project again I think I'd get a rear hub and attach it to a bike with front shocks.
To get to work in an hour I have to have the speedo reading 30 km/hr much of the time. City of Toronto roads need some TLC, so aluminum frame and only a seatpost shock still make it a pretty rough ride.