How the Mercedes-Benz EQXX Achieved 1,008km Range on a Single Charge: Breaking Barriers in EV Efficiency

One of the most persistent criticisms of electric vehicles (EVs) is their limited range and significantly slower recharge speeds compared to internal combustion engine (ICE) cars. The core issue lies in the lower energy density of batteries versus gasoline or diesel fuel.

There are two primary ways to extend a vehicle’s range:

1. Increase energy storage capacity – This is straightforward and cost-effective for ICE vehicles but much more complex and expensive for EVs.

2. Optimize efficiency – This includes reducing aerodynamic drag, rolling resistance, and vehicle weight.

The Mercedes-Benz Vision EQXX achieved an incredible milestone—1,008 km on a single charge with an average consumption of just 8.7 kWh/100 km and an average speed of 87 km/h. Let’s explore the innovations that made this possible.

Aerodynamics: Leading the Way in Drag Reduction

Aerodynamic drag is the top energy consumer at highway speeds. The EQXX boasts a drag coefficient (Cd) of 0.17 and a frontal area of 2.12 m², resulting in an impressively low drag area of 0.36 m². By contrast, the already aerodynamic Mercedes EQS has a drag area of 0.5 m²—39% higher than the EQXX.

Mercedes-Benz achieved this through:

Waterdrop-shaped body design

50mm narrower rear track

On-demand active aero cooling

Long tail design

Fully covered 20-inch wheels to minimize wheel-induced drag

At 130 km/h, the EQXX needs only 14 PS to cruise—an extremely low power requirement for any vehicle.

Powertrain: 95% Efficiency from Battery to Wheels

The EQXX powertrain delivers 95% efficiency, which is extraordinary. It means only 5% of the energy is lost from the battery to the wheels.

This level of efficiency demands:

Ultra-efficient power electronics

High-efficiency electric motor (likely a permanent magnet synchronous motor)

Minimal cooling requirements thanks to optimized design

The motor outputs 180 kW (245 PS) with torque expected around 400 Nm.

Lightweight Body Construction

To reduce energy consumption, lightweight construction was essential:

Vehicle weight: 1,755 kg

Battery weight: ~500 kg

Materials used:

Aluminum, martensitic steel, carbon fiber reinforced plastics

Forged magnesium wheels

Aluminum brake discs – a first in the auto industry

These choices reduce unsprung mass and enhance both performance and ride comfort. Mercedes employed bionic engineering principles—using material only where structurally necessary.

Solar Power & Interior Efficiency

The EQXX features a solar roof with 117 solar cells. These power the low-voltage systems like infotainment, fans, and lights, contributing up to 25 km of extra range in ideal conditions.

Interior materials are sustainable and ultra-light, aligning with the EQXX’s efficiency-focused design philosophy.

High Voltage Battery: World-Leading Energy Density

The EQXX’s battery:

100 kWh usable energy

~500 kg weight

Cell-to-pack design (no modules)

Air cooled, with carbon fiber top lid

>900V architecture for ultra-fast charging potential (limited by cooling method)

The breakthrough is its high-silicon anode, enabling energy density of 200 Wh/kg—the highest in any production EV battery to date. That’s 30% lighter and 50% smaller than the EQS battery.

Final Thoughts

The Mercedes-Benz EQXX is a concept, but its technologies—ultra-efficient aerodynamics, high-voltage architecture, lightweight materials, and high-silicon battery chemistry—could soon appear in production EVs. This could mark a turning point in EV range anxiety and accelerate the adoption of sustainable mobility.