Mercedes-Benz C-Class Saloon 2022 Owner's Manual page 412

In this case you may neither jump-start the vehi-
cle nor charge the battery.
The service life of a battery that has been thawed
may be dramatically shortened. The starting char-
acteristics may be impaired, especially at low
temperatures.
It is recommended that you have a thawed battery
checked at a qualified specialist workshop.
Plug-in hybrid
If your vehicle has been started with starting
assistance, it may not be possible to use the elec-
tric drive for approximately 30 minutes.
Starting assistance is not considered to be a nor-
mal operating condition.
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 assis-
tance 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 come
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into contact with any parts which may move
when the engine is running.
Always make sure that neither you nor the bat-
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tery is electrostatically charged.
Keep away from fire and naked flames.
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Do not lean over the battery.
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Breakdown assistance 409
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 only be provided
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using vehicles, batteries or other jump start
devices with a nominal voltage of 12 V.
The vehicles must not touch.
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Vehicles with a petrol engine: jump-start the
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vehicle only when the engine and exhaust sys-
tem are cold.
Starting assistance and charging the 12 V battery
Preparing starting assistance/charging
Secure the vehicle by applying the electric
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parking brake.
Switch the transmission to position j.
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