The solid-state battery in the EQS-based vehicle provides up to 25 per cent more range than the standard battery in the production EQS. According to the manufacturer's preliminary estimates, the vehicle under development will have a range of more than 1,000 kilometres. In comparison, the current EQS 450+ with a battery capacity of 118 kWh can travel around 800 kilometres on a single charge.
After intensive testing on various test benches, the solid-state battery prototype has been integrated into the EQS at the end of 2024. The all-electric Mercedes-Benz car was slightly modified to accommodate the solid-state battery and was equipped with all accessories for its operation. The first laboratory tests of the car were conducted in Stuttgart at the end of 2024 to prepare for road tests, which began in February 2025.
Solid-state batteries are a promising technology. They use solid electrolyte instead of liquid electrolyte, which increases cell safety and enables the use of new anodes such as lithium-metal anodes, thereby significantly outperforming conventional lithium-ion cells. They also provide higher energy density and increased range without increasing size and weight compared to their existing lithium-ion counterparts. In addition, solid-state batteries are safer to operate.
In the coming months, Mercedes-Benz will conduct extended road and laboratory tests to evaluate the durability and stability of the solid-state battery in real-world conditions.
Source: Mercedes-Benz