I wrote an article about Fiat's development of electrically powered 850s. In America someone also started working on this and converted his Spider to electric with a 96 volt system. The batteries are everywhere! Fiat did it like this:

Elektrisch aangedreven Fiat 850 Spider Elektrisch aangedreven Fiat 850 Berlina

Elektrisch aangedreven Fiat 850 Spider Elektrisch aangedreven Fiat 850 Spider

Range? A maximum of 80 kilometers, but due to the type of batteries, this was quite reduced by all kinds of circumstances.
The owner also appeared in the newspapers with his creation:

Elektrisch aangedreven Fiat 850 Spider