Mercedes-Benz C-CLASS CABRIOLET Operator's Manual page 303

All vehicles except vehicles with a lithium-ion battery: do not start the engine if the battery
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is frozen. Let the battery thaw first.
Jump-starting may be performed only using batteries with a nominal voltage of 12 V.
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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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Make sure that:
The jumper cables are not damaged.
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Bare parts of the terminal clamp do not come into contact with other metal parts while the jumper
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cables are connected to the battery.
The jumper cables cannot come into contact with parts that can move when the engine is running,
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such as the V-belt pulley or the fan.
Secure the vehicle by applying the electric parking brake.
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Shift the transmission to position j.
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Make sure that the ignition is switched off. All indicator lamps in the instrument cluster must be
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off. When using the SmartKey, turn the SmartKey to position u in the ignition lock and remove it
( page 122).
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Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
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Open the hood.
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Position number C identifies the charged battery of the other vehicle or an equivalent jump-starting
device.
Lift up panel B.
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Slide cover A of positive terminal : in the direction of the arrow.
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Connect positive terminal : on your vehicle to positive terminal ; of donor battery C using the
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jumper cable, Always begin with positive terminal : on your own vehicle first.
Start the engine of the donor vehicle and run it at idling speed.
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Connect negative terminal = of donor battery C to ground point ? of your vehicle using the
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jumper cable, connecting the jumper cable to battery of other vehicle C first.
Start the engine.
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Before disconnecting the jumper cables, let the engine run for several minutes.
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Jump-starting
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301