The 2016 Mercedes-Benz C350 Plug-In Hybrid Estate uses the currently most advanced form of Hybrid technology. Its electrical energy storage unit is a high-voltage lithium-ion battery with a total capacity of 6.2 kWh, which can be charged from an external power source and so makes an effective contribution to the low consumption and emission figures. The battery is water-cooled, weighs around 100 kilograms and is mounted in a sheet steel housing underneath the rear axle in order to maximise crash safety, driving dynamics and boot space. Despite the space taken up by the battery, the 2016 Mercedes-Benz C350 Plug-In Hybrid Estate still has a boot capacity of
335 litres in its Saloon format and of 350 in the 2016 Mercedes-Benz C350 Plug-In Hybrid Estate or in the latter case of 1370 litres with the rear-seat backrests folded down and, as ever, a level load compartment floor.