Charging socket

The high-voltage battery can be recharged at charging stations and at household power outlets via the charging socket integrated into the rear bumper. A standard charge at a normal power outlet with a charging capacity of 1.8 kW takes about three hours. With a charging capacity of 3.6 kW provided by public charging stations or wall box chargers installed in the garage at home, the charging time can be reduced to around 1.5 hours. The charging times may be longer if pre-entry climate control is activated or in extreme climatic conditions (temperature).

On-board charger

The on-board charger is permanently installed in the vehicle near the battery, ensuring optimal lengths of the connecting power cables and water hoses for cooling. It provides single-phase charging at up to 16 A. The operating data of the charging process and the available capacity are permanently transmitted to the vehicle energy management system, which controls the charging process.

The high-voltage battery – safely designed and tucked away in a compact space

The lithium-ion battery based on lithium-iron phosphate technology, which is already in use in the C 350 e, has 88 individual cells connected in sequence with a gross total capacity of 6.4 kWh. It is integrated well protected above the rear axle. To ensure maximum crash safety, the housing is manufactured of die-cast aluminium. The objective in integrating the high-voltage battery was maximising the available boot volume as well as the tank and battery capacity. The result: an impressive boot volume of 400 litres. The high-voltage battery can be recharged on the external power grid with a 3.6-kW on-board charger.

Power electronics

To reduce complexity of the wiring, packaging and cooling, the DC/DC converter was integrated into the power electronics. It bolsters the 12-volt on-board electrical system with up to 3 kW. Like the majority of the high-voltage components, the power electronics are installed in the rear part of the vehicle.

Transmission with integrated electric motor

The high-efficiency 9G-TRONIC hybrid transmission celebrates its world première in the new E-Class. Thanks to the innovative and highly compact hybrid traction head with integrated torque converter, decoupling clutch and powerful electric motor, the familiar 9G-TRONIC nine-speed torque converter automatic transmission is effectively electrified.

Internal combustion engine

The engine is an M274 turbocharged 2.0-litre four-cylinder petrol engine with direct injection and spray-guided combustion in the middle output stage of the engine, rated at 155 kW.

Electric high-voltage refrigerant compressor and high-voltage heater booster

The electric high-voltage refrigerant compressor and high-voltage heater booster offer, among other things, the possibility of interior pre-entry climate control in summer and winter.

Regenerative brake system

During braking, energy is converted via the electric motor and fed into the high-voltage battery. The significant reduction in friction losses inside the 9G-TRONIC hybrid transmission has a positive impact on the energy-recovery potential.


To ensure that the battery always operates in the optimal temperature range, the components are cooled by a dedicated cooling circuit. The heat is dissipated to the ambient air by a sophisticated thermal management system either directly via a dedicated radiator or to the cooling circuit of the air conditioning system via a heat exchanger. This allows cooling the battery with maximum possible efficiency under small loads or when outside temperatures are low, and nonetheless always ensuring adequate cooling with heavy use or when the outside temperatures are high.

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