Mercedes-Benz S-Class 2020 Operator's Manual page 437

Observe the following points during starting
assistance and when charging the battery:
Only use undamaged jumper cables/charg‐
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ing cables with a sufficient cross-section and
insulated terminal clamps.
Non-insulated parts of the terminal clamps
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must not come into contact with other metal
parts while the jumper cable/charging cable
is connected to the battery/jump-start con‐
nection point.
The jumper cable/charging cable must not
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come into contact with any parts which may
move when the engine is running.
Always make sure that neither you nor the
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battery is electrostatically charged.
Keep away from fire and open flames.
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Do not lean over the battery.
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Observe the additional following points when
charging the battery:
Only use battery chargers tested and
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approved for Mercedes-Benz.
Read the battery charger's operating instruc‐
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tions before charging the battery.
Observe the additional following points during
starting assistance:
Starting assistance may be performed using
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only batteries with a nominal voltage of 12 V.
The vehicles must not touch.
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Vehicles with a gasoline engine: Jump-
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start the vehicle only when the engine and
exhaust system are cold.
Starting assistance and charging the 12 V
battery
Requirements:
The vehicle is secured with the electric park‐
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ing brake.
The transmission is in position j.
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The ignition and all electrical consumers are
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switched off.
The hood is open.
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Breakdown assistance 435
Slide cover 3 of positive clamp
#
jump-starting connection point in the direc‐
tion of the arrow.
Connect positive clamp 4 on your vehicle to
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the positive pole of the donor battery using
the jumper cable/charging cable. Always
begin with positive clamp 4 on your own
vehicle first.
4 on the