One of the problems with electric cars is how to charge the battery if you have to park in the street or your destination doesn't have a a suitable charging point.

The Itaian manufacturer Estrima has solved the problem in its tiny Birò electric car by making the batterey removable, so that it can be taken indoors for recharging – or could be replaced by a second battery while it is being charged.

The tiny two-seater has been selling in Italy and other European countries for several years. Until now buyers have been able to choose between lead, lithium-ion and higher-capacity "Lithium Maxi" batteries, none of which were designed for quick removal. Now, they have the added option of a lithium-ion "Re-Move" battery which provides approximately 40 kilometres of driving range, and can be charged in four hours.