This depends on the size of the battery and its energy capacity (measured in kWh, or ‘kilowatt-hour’). Smaller city electric cars tend to have smaller batteries and therefore are limited to how far they can travel on a single charge. For example, the Smart ForTwo EQ has a 17kWh battery which has a maximum range of 91 miles. Meanwhile the Renault Zoe, which is a bigger car, has a larger 50kWh battery and can travel 245 miles between charges.