Mercedes-Benz announced on Tuesday that starting in 2025, it will use a new, highly energy-dense battery in its future electric G-Class, solving the challenge of how to power huge electric cars without weighing them down with heavy batteries.

According to Mercedes-Benz, the battery is 20-40 percent more energy-dense than comparable cells currently available and was developed by start-up Sila Nanotechnologies.

Silicon, which Tesla claimed will increase its use of in its batteries by 2020, is a better option than graphite, which comes from China 70% of the time.

Mercedes-Benz is the first publicly announced automotive customer of Sila Nanotechnologies, a California-based battery start-up that revealed in early May that it was investing in a new plant in Washington state that will open in 2024.