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  • E-Class
  • Saloon
  • 08/2019
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Notes on the high-voltage battery
NOTE Damage caused to the high-voltage battery through lengthy idle periods or exhaustive discharging

Lengthy idle periods with a high charge level may result in an accelerated ageing of the high-voltage battery.

Exhaustive discharging caused by the battery being idle for lengthy periods can damage the high-voltage battery.

Before long idle periods, park the vehicle with a high-voltage battery charge level between 30% and 50%. Do not keep the high-voltage battery continuously connected to power supply equipment.
Check the charge level of the high-voltage battery every two to three months.

Recharge the high-voltage battery if the charge level is insufficient.

You can check the charge level of the high-voltage battery in the multimedia system: More

Charging options for the high-voltage battery (mode 2 and 3)
Charging while the vehicle is in motion by means of:

  • Recuperation

  • Combustion engine (CHARGE operating mode)

The electric motor is operated as an alternator when in overrun mode and during braking in order to charge the high-voltage battery while driving.

You have the following options to charge while stationary:

  • At a mains outlet (mode 2)

  • At a wallbox (mode 3)

  • At a charging station (mode 3)

The high-voltage battery can be charged in a nominal voltage range from 100 V to 400 V.

It is recommended that you charge the high-voltage battery at a wallbox or charging station due to the improved charging performance and better charging efficiency offered.

System limits
The power output of the high-voltage battery may be impaired by the following:

  • High or low outside temperatures

  • Electrical auxiliary consumers in the vehicle being switched on, e.g. operating the climate control system

  • Extended periods without charging

The charging time of the high-voltage battery may be increased by the following:

  • High or low outside temperatures

  • Extended periods without charging

  • The maximum available charging current of the wallbox or power supply equipment

  • The charging current set (mode 2) in the multimedia system More

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