Mercedes-Benz 2013 C-Class W204 Sedan Owner's Manual page 362

Jump-starting
360
Only use jump leads that 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
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for a few minutes before attempting to start. This charges the empty battery a little.
Make sure that the two vehicles do not touch.
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Make sure that:
the jump leads are not damaged.
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bare parts of the terminal clamp do not come into contact with other metal parts while the
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jump leads are connected to the battery.
the jump leads cannot come into contact with parts such as the V-belt pulley or the fan.
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These parts move when the engine is started and while it is running.
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Firmly depress the parking brake.
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Manual transmission: depress the clutch pedal fully and shift to neutral.
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Automatic transmission: move the selector lever to P.
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Switch off all electrical consumers, e.g. rear window heating, lighting etc.
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Open the bonnet.
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
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Slide cover : 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 B
using the jump lead. beginning with your own battery.
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Start the engine of the donor vehicle and run it at idling speed.
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Connect negative terminal ? of donor battery B to earth point A of your vehicle using
the jump lead, connecting the jump lead to donor battery B first.
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Start the engine.
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Before disconnecting the jump leads, let the engines run for several minutes.