Excellent idea for a thread!

We including prototypes?

BMW E1,


From Wikipedia:
The E1 was founded in 1991 on the IAA of BMW unveiled in Frankfurt.

The E1 is a 2 +2- seater, only 3.4 meters long but with 1.60 m width almost as wide as a former BMW of 3 series . Also, the design language of the former BMW models has been adopted as the double glazed front headlights.

The particularity of this model is that this is a purely electric vehicle. The motor, which is mounted directly over the rear axle, making 32 kW and delivers its power, as usual with BMW, to the rear wheels off. The top speed is 120 km / h, acceleration from 0-50 km / h in six seconds. The 200-kilogram sodium-sulfur battery with 120 volt and 19 kWh provides power for about 250 km prepared to the BMW E1 must for 6-8 hours into the AC outlet. The vehicle has a regenerative braking ( regenerative braking ) with the help of the traction battery has been charged by the braking energy partially. Outstanding for the period are integrated in the wheels drum brakes. [1]

The E1 was never manufactured by BMW in series and it also existed only a model of this type. One reason for this were shortcomings of the battery, but also the changes in the California CARB legislation, which had obliged the carmaker to develop zero-emission vehicles by July 2002. Direct competitors would be for the E1 of the now set A2 Audi or the Mercedes A-Class . According to a source, this prototype is to be burned, so the built E1 / 1. [2]