There are a number of batteries available for electric vehicles, however the most cost effective is the old faithful lead-acid batteries. We have three choices comonly available to us at this time; six volt, eight volt and twelve volt batteries. This 120 volt kit will require 20 six volt batteries or 15 eight volt batteries or 10 twelve volt batteries. Batteries can be placed just about any place they can fit, as in this picture under the back sit. You will want to keep in mind the weight distribution recommended by the vehicle manufacture when installing batteries.