Charging The High-Voltage Battery - Mercedes-Benz EQS 2023 Operator's Manual

Charging the high-voltage battery

Notes on charging the high-voltage battery
* NOTE High-voltage battery damage due to
leaving the vehicle idle for lengthy periods
of time
Lithium-ion batteries experience a natural self-
discharge.
Exhaustive discharging can therefore occur if
the vehicle is idle for several months. This can
damage the high-voltage battery.
To avoid damage, please observe the fol-
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lowing recommendations when handling
the high-voltage battery.
* NOTE Accelerated ageing of the high-volt-
age battery due to not observing the fol-
lowing recommendations
As a result of its basic characteristics, the
storage capacity of, and the amount of energy
available from, the high-voltage battery
decreases over the course of its life. As a
result, the maximum electrical range that can
be achieved by the vehicle is reduced and its
maximum electrical output can be impaired.
The following factors could accelerate the age-
ing of the high-voltage battery:
frequently fully charging (charge level
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100%) the high-voltage battery, especially
when this process is not directly followed
by a journey
frequent rapid charging with direct current
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(mode 4)
leaving the vehicle idle for lengthy periods
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at high ambient temperatures
To avoid accelerated ageing, please
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observe the following recommendations
when handling the high-voltage battery.
Recommendations when handling the high-voltage
battery:
Every six months, when the outside tempera-
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ture is above 10°C, park the vehicle overnight
with a charge level below 20%.
F297 0017 02
Driving and parking 303
Only charge the high-voltage battery with
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direct current (mode 4) if necessary.
Charge the high-voltage battery on average to
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a charge level of 80%. Beyond a charge level of
80%, the charging time is considerably pro-
longed.
If leaving the vehicle idle for lengthy periods,
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park up 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.
If leaving the vehicle idle for lengthy periods of
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time avoid, if possible, high ambient tempera-
tures.
Check the high-voltage battery's charge level
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every six weeks ( page 322).
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Charge the high-voltage battery if the charge
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level is below 20%.
Do not disconnect the 12 V battery even if the
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vehicle is left idle for a lengthy period. Other-
wise, the condition of the vehicle's high-volt-
age battery cannot be monitored.