Normally there are 6pcs/1set Lead Acid batteries will be used in a electric cars. And the price for one set with better quailit,such as Korean Phoenix brand, is no more than $1800.00, the life-span is about 2years. As you know, the electric cars are low-maintenace rate except the replace of batteries, so we think the cose of use will be more lower than a gas car. By the way, are you interested a two-seat electric car which is made in China and have been successfully launched into USA market? Please contact us for detail: electroautoe-v@hotmail.com or Skype: majiangwu