4 cars
NanoFlowcell AG is a research-and-development company based in Vaduz, Liechtenstein, working on flow-cell (flow battery) technology. It showcases its work through concept cars: the Quant e-Sportlimousine sedan, shown in Geneva in 2014, and the later, smaller Quantino models. The vehicles run on an electric flow battery that draws energy from two ionic electrolyte solutions. It is not a series carmaker — the cars remain technology-demonstrating prototypes.