As interest grows in the possibility of electric vehicles (EVs) replac
ing conventional internal-combustion-engined-powered vehicles in many
major cities, attention is being given to the development of improved
batteries. Heavy-duty, lead/acid batteries have served the needs of lo
w-performance vehicles, such as milk floats and fork-lifts, for many y
ears. The demands of high performance in a lightweight vehicle, howeve
r, have increased the battery loading substantially. The performance r
equirements of a modern, traffic-compatible EV are reviewed and corres
ponding requirements on the battery discussed.