http://www.vegoilcar.co.uk/electric-car-conversion.php

Electrically converted vehicles are often faster. They can have phenomenal acceleration previously only experienced by Supercars. They’re quiet, though they have a limited travel range between charges, but now in the region of a couple of hundred miles. They are virtually maintenance free and amazingly good to the environment (if you source your electricity cleanly). But they are expensive! For the price of a good electric motor, you can buy a small electric car. The motor needs a dedicated controller, and these tend to be specific to a motor and cost as much, if not more, than the motor. And then there’s batteries… I won’t bore you with this amazingly complex subject, but battery technology has really come on – but it’s still so expensive, the single largest budget item of any electric build I hear.