Mercedes-Benz CLA-Class 2015 - Manual (Page 312)

Do not start the vehicle using a rapid charging device. If your vehicle's battery is discharged,
the engine can be jump-started from another vehicle or from a second battery using jumper
cables. Observe the following points:
R
The battery is not accessible in all vehicles. If the other vehicle's battery is not accessible,
jump-start the vehicle using a second battery or a jump-starting device.
R You may only jump-start the vehicle when the engine and exhaust system are cold.
R Do not start the engine if the battery is frozen. Let the battery thaw first.
R
Only jump-start from batteries with a 12 V voltage rating.
R
Only use jump leads that are not damaged and have a sufficient cross-section and insulated
terminal clamps.
R Make sure that the two vehicles do not touch.
Make sure that:
R the jumper cables are not damaged.
R when the jumper cables are connected to the battery, uninsulated sections of the terminal
clamp do not come into contact with other metal sections.
R the jumper cables cannot come into contact with parts which can move when the engine is
running, such as the V-belt pulley or the fan.
X
Secure the vehicle by applying the electric parking brake.
X
Shift the transmission to position P.
X
Turn the SmartKey to position 0 in the ignition lock and remove it.
X Switch off all electrical consumers, e.g. rear window defroster, lighting, etc.
X Open the hood.
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
X
Press together cover : of positive clamp ; and slide it back.
X
Connect positive terminal ; on your vehicle to positive terminal = of donor battery B
using the jumper cable, beginning with your own battery.
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Jump-starting
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