The Battribike Buzz is a heavy little workhorse with a lead acid battery, delivered half-assembled for £375 in 2009 - less than half the cost of an electric commuter bike. It would suit a bike trailer, and it has a large strong rack on the back as part of the frame, to hold a panniers or a trunk over sprung suspension front and back. It might be good for regular short deliveries, moving things around a warehouse, or an up-hill trip to the nearest station. The U-shaped frame is heavy but allows you to step on and off easily. The stand comes in handy, as you wouldn't want to lift the thing up every time you use it.