In 2003, AC Propulsions redesigned its rather impractical lead acid battery powered EV called “tzero”, with lithium-ion batteries. 6,800 to be exact. (Much like the Tesla Roadster) Removing the rather impractical and environmentally unfriendly NiMH battery resulted in four times the power and 500 fewer pounds. Tzero can travel 300 miles on a charge and accelerate 0-60 mph in 3.6 seconds.