Over the years a number of people have built EVs by removing the engine from small cars and stuffing the engine compartment full of deep cycle batteries. Search the internet and you will find them. It does work. The limitations seem to be that speed and acceleration is limited. Lead acid doesn't respond to load as well. Range of these vehicles tends to be less than 50 miles. In daily use, I'm not sure if the deep cycle batteries will last more than a year or two.

Maybe some other people have some first hand experience.