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Avoid fire, naked flames, creating
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sparks and smoking.
Make sure that there is sufficient venti‐
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lation during the charging process and
during starting assistance.
Do not lean over a battery.
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If the indicator/warning lamps in the instrument
cluster do not light up at low temperatures, it is
very likely that the discharged battery has fro‐
zen.
& WARNING Risk of explosion from a fro‐
zen battery
A discharged battery may freeze at tempera‐
tures slightly above or below freezing point.
During starting assistance or battery charg‐
ing, battery gas may be released.
Always thaw a frozen battery out first
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before charging it or performing start‐
ing assistance.
The service life of a battery that has been
thawed may be dramatically shortened.
It is recommended that you have a thawed bat‐
tery checked at a qualified specialist workshop.
All vehicles
* NOTE Damage caused by numerous or
extended attempts to start the engine
Numerous or extended attempts to start the
engine may damage the catalytic converter
due to non-combusted fuel.
Avoid numerous and extended attempts
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to start the engine.
Observe the following points during starting
assistance and when charging the battery:
Only use undamaged jump lead/charging
R
cables with a sufficient cross-section and
insulated terminal clamps.
Non-insulated parts of the terminal clamps
R
must not come into contact with other metal
parts while the jump lead/charging cable is
connected to the battery/jump-start connec‐
tion point.
Breakdown assistance 379
The jump lead/charging cable must not
R
come into contact with any parts which may
move when the engine is running.
Always make sure that neither you nor the
R
battery is electrostatically charged.
Keep away from fire and naked flames.
R
Do not lean over the battery.
R
When charging: only use battery chargers
R
tested and approved by Mercedes-Benz, and
please read the battery charger's operating
instructions before charging the battery.
Observe the additional following points during
starting assistance:
Starting assistance may only be provided
R
using batteries with a nominal voltage of
12 V.
The vehicles must not touch.
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Petrol engine: only accept starting assis‐
R
tance if the engine and exhaust system are
cold.
Secure the vehicle by applying the electric
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parking brake.
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