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The ACM City is a three-seater, electrically-powered lightweight vehicle of the L7e class, primarily designed for use as a taxi in cities. It weighs just 450 kg, reaches a maximum speed of 90 km/h, has room for a driver and two passengers, and boasts a luggage compartment for up to four cases. To extend its cruising range, replacement batteries have been integrated, developed by BMZ , a leading system supplier of battery packs. Eight of these replacement modules, each weighing just 12 kg, are stored in the underbody of the vehicle. Empty batteries can be removed via compartments on either side of the vehicle and swapped with charged ones by means of a simple manual operation.

The e-taxi was developed in the Adaptive City Mobility research project, with the objective of designing an emission-free e-mobility system for towns for the German Federal Ministry for Economic Affairs and Energy (BMWi). Ten partners from science and industry, including Siemens, the Fraunhofer Institute for Embedded Systems and Communication Technologies ESK, Green City, and RWTH Aachen University, are involved in the project.