The Mercedes-Benz electric liftback positioned as the battery-electric counterpart to the S-Class is the Mercedes-Benz EQS.
The EQS is Mercedes-Benz's full-size electric luxury flagship, occupying the role that the S-Class traditionally fills in the company's range. Unlike a conventional sedan, it uses a five-door liftback body, but its size, equipment, refinement and technology place it firmly in the top luxury category. The production car debuted in April 2021 after the Vision EQS concept was shown in 2019.
It was built on Mercedes-Benz's dedicated electric architecture, rather than simply converting an existing S-Class platform. A large underfloor battery, rear- or all-wheel drive and a very aerodynamic body were central to its design. The EQS 450+ version was especially noted for its long WLTP range and low drag coefficient.
The model names can be confusing. The EQE is the smaller executive-class sibling, broadly analogous to the E-Class, while the EQB and EQA are smaller electric SUVs. The EQS SUV is related to the EQS but is a taller, separately styled utility vehicle; the liftback in this question is the standard EQS saloon.