FAR-A-DAY, the French trailer that adds 300 km of range
- Published on 25/11/2025 12:43
- Modified on 25/11/2025 12:46
The French startup FAR-A-DAY, specializing in e-mobility, will launch a “battery” trailer on highways in 2026.
Electric mobility is progressing, but it faces a persistent paradox: affordable cars (under 30,000 euros even today) offer limited autonomy on highways, while long-distance models remain expensive, heavy, and energy-consuming.
The young French startup FAR-A-DAY, officially launched in November 2025, claims to have found a solution to overcome this structural barrier. Its name is a clever nod to Michael Faraday, not to mention the double meaning of “far-a-day” (“going far in one day”), already reflecting its ambition: to enable drivers to cover long distances without wasting excessive time at a charging station.
Its idea is a removable and rolling external battery capable of adding 60 kWh, which translates to over 300 km of real autonomy, in just two minutes. A promise that, if confirmed, could profoundly change the way an electric vehicle is used.
One of the most interesting points of the concept is its relevance for small electric cars, particularly those with rapid charging limited to around 30 to 50 kW. These models also struggle the most on highways: a e-208, for instance, requires nearly 30 minutes to regain 100 to 150 km of autonomy, forcing its driver to take multiple breaks on a long trip. FAR-A-DAY’s mobile battery reverses this logic: instead of waiting for the car to charge, the autonomy comes to the vehicle.
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Too good to be true?
The prototype, akin to a compact 500 kg trailer, attaches to the rear of the vehicle via a specific hitch to be installed in advance. The founders emphasize the decisive advantage of an effortless installation, where rapid charging still requires extended stops of 20 to 40 minutes depending on the models. The first prototypes have accumulated 200,000 kilometers of testing, a significant volume that proves the concept is tried and tested.
However, FAR-A-DAY does not just offer a product: the startup plans a network of dedicated stations, installed at highway entrances and partially powered by solar panels. After reserving on an app, the driver retrieves their battery, attaches it in 2 minutes, and then drops it off further along or at their destination. The first corridor targeted will connect Paris to Bordeaux as early as 2026, followed by the opening of 30 stations in 2027, expected to cover 80% of long-distance trips in France.
The service also revitalizes the used car market, where aging batteries face natural performance degradation over long distances. For these vehicles, the promise of “instantly” regaining 300 km of autonomy is particularly attractive.
And what about the price of FAR-A-DAY?
“The French no longer need to buy expensive models to travel long distances electric,” asserts Arthur Darde, CEO, defending the idea of a dissociation between autonomy and purchase price. The approach also aligns with a logic of sobriety: a small battery for daily trips, and a temporary extension for weekends or vacations.
Despite its appeal, the concept nevertheless raises several essential questions. The first concerns the actual compatibility with the entire electric vehicle fleet: each vehicle has its own battery architecture, communication protocols, and internal safety systems.
Furthermore, there are questions regarding road behavior: an additional 500 kg on a rear overhang is not trivial, even though FAR-A-DAY claims to have patented a system allowing for seamless driving, including when reversing. Independent tests will be necessary to verify the impact on stability, consumption, or braking.
Finally, the success of the model will depend on the speed of deploying the stations and pricing. FAR-A-DAY promises service prices equivalent to those of a charging station on the highway, with reduced waiting time. The argument is attractive, to be honest. As for the installation of the hitch, the startup promises it will be free and quick for early adopters.
We will need to verify all of this in 2026, when the service is truly deployed.
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This page is translated from the original post "FAR-A-DAY, la remorque française qui rajoute 300 km d’autonomie" in French.
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