The biggest downside of the Zoe is the rented batteries, as you've mentioned. But depending on the mileage you cover, battery leasing can cost as little as £49 a month - which is still considerably cheaper than paying for fuel for even a very economical petrol car (unless you cover very, very low miles). A plus side of leasing batteries is you don't need to be too concerned about the batteries degrading over time (which they will), as Renault will replace any battery that drops below 75 per cent of its original capacity. The downside is that an early Zoe might only be able to provide a range of around 70 miles. However, if you only use the car for short journeys and can charge at home, this is unlikely to be a problem.