Mercedes-Benz 2012 A Class - Manual (Page 311)

characteristics may be impaired, especially at low temperatures. Have the thawed battery
checked at a qualified specialist workshop.
Do not use a rapid charging device to start the vehicle. If your vehicle's battery is discharged,
the engine can be jump-started from another vehicle or from a second battery using jump
leads. Observe the following points:
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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
Vehicles with a petrol engine: 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
Jump-starting may only be performed from batteries with a nominal voltage of 12 V.
R
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
for a few minutes before attempting to start. This charges the empty battery a little.
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Make sure that the two vehicles do not touch.
Make sure that:
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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
jump leads are connected to the battery.
R
the jump leads 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 Manual transmission: shift into neutral.
X Automatic transmission: shift the transmission to position P.
X Turn the key to position 0 in the ignition lock and remove it.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the bonnet ( Y page 285).
Jump-starting
309
Breakdown assistance
Z