A number of manufacturers have trialled range extenders. They add complexity and weight, though - most buyers will be better looking for a pure-electric vehicle or, if they're not ready for that, a conventional hybrid car. BMW dropped the range-extender i3 in 2018 because advances in battery technology meant the regular i3 could travel further on a charge. Today, BMW i3 Range Extender models are seen as less desirable on the used market as they're more likely to go expensively wrong.