Mercedes-Benz CLS Operator's Manual page 329

Only jump-start from batteries with a 12 V voltage rating.
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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
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for 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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when the jumper cables are connected to the battery, uninsulated sections of the terminal
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clamp do not come into contact with other metal sections.
the jumper cables cannot come into contact with parts which can move when the engine
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is running, such as the V-belt pulley or the fan.
Apply the parking brake firmly.
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Shift the transmission to position P.
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Switch off all electrical consumers (e.g. radio, blower, etc.).
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Open the hood.
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Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
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
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using the 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 B to ground point A of your vehicle using
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the jumper cable, connecting the jumper cable to battery of other vehicle B 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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