Mercedes-Benz S-Class Coupe Operator's Manual page 315

Particularly avoid fire, open flames, creating sparks and smoking. Ensure there is sufficient ven-
tilation while charging and jump-starting. Do not lean over a battery.
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WARNING
During the charging process, a battery produces hydrogen gas. If a short circuit occurs or sparks
are created, the hydrogen gas can ignite. There is a risk of an explosion.
Make sure that the positive terminal of a connected battery does not come into contact with
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vehicle parts.
Never place metal objects or tools on a battery.
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It is important that you observe the described order of the battery terminals when connecting
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and disconnecting a battery.
When jump-starting, make sure that the battery poles with identical polarity are connected.
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It is particularly important to observe the described order when connecting and disconnecting
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the jumper cables.
Never connect or disconnect the battery terminals while the engine is running.
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WARNING
A discharged battery can freeze at temperatures below freezing point. When jump-starting the
vehicle or charging the battery, gases can escape from the battery. There is a risk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
If, at low temperatures, the indicator lamps/warning lamps in the instrument cluster do not light up,
it is highly likely that the discharged battery has frozen. In this case, you may neither charge the
battery nor jump-start the vehicle. The service life of a thawed-out battery may be shorter. The
starting characteristics can be impaired, particularly at low temperatures. Have the thawed-out
battery checked at a qualified specialist workshop.
All vehicles:
!
Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter could be
damaged by the non-combusted fuel.
Do not start the vehicle using a rapid charging device. If your vehicle's battery is discharged, the
engine can be jump-started from another vehicle or from a second battery using jumper cables.
Observe the following points:
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible, jump-
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start the vehicle using a second battery or a jump-starting device.
You may only jump-start the vehicle when the engine and exhaust system are cold.
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All vehicles except Cabriolets or Mercedes-AMG vehicles: do not start the engine if the
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battery is frozen. Let the battery thaw first.
Only jump-start from batteries with a 12 V voltage rating.
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Only use jumper cables which have a sufficient cross-section and insulated terminal clamps.
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If the battery is fully discharged, leave the battery that is being used to jump-start connected for
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a few minutes before attempting to start. This charges the battery slightly.
Make sure that the two vehicles do not touch.
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Jump-starting
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