Mercedes-Benz C-Class Saloon Owner's Manual page 399

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. In this case you may neither jump-start the
vehicle nor charge the battery.
The service life of a battery that has been
thawed may be dramatically shortened. The
starting characteristics may be impaired, espe‐
cially at low temperatures.
It is recommended that you have a thawed bat‐
tery checked at a qualified specialist workshop.
All vehicles
Plug-in hybrid: observe the notes in the Supple‐
ment. Otherwise, you may fail to recognise dan‐
gers.
* 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
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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 jump lead/charging cable is
connected to the battery/jump-start connec‐
tion point.
The jump lead/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 naked 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.
Breakdown assistance 397
Observe the additional following points during
starting assistance:
Starting assistance may only be provided
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using batteries with a nominal voltage of
12 V.
The vehicles must not touch.
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Petrol engine: only accept starting assis‐
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tance if 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.
Automatic transmission: the transmission
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is in position j.
Manual transmission: the transmission is in
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neutral.
The ignition and all electrical consumers are
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switched off.
The bonnet is open.
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