Mercedes-Benz 2010 E-Class Coupe Operator's Manual page 288

Jump starting
286
Make sure the cable clamps do not touch
any other metal part while the other end is
still attached to a battery.
If the battery is discharged, the engine can be
started with jumper cables and the fully
charged battery of another vehicle or an
equivalent starter pack. Observe the
following:
Access to the battery is not possible on all
R
vehicles. If you cannot access the battery
of the other vehicle, provide jump start
power by an external battery or starter
pack.
Jump starting should only be performed
R
when the engine and catalytic converter
are cold.
Do not jump start the engine or charge the
R
battery if the battery is frozen. Let the
battery thaw out first.
Only jump start from batteries with the
R
same voltage rating (12 V). Jump starting
with a more powerful battery could damage
the vehicle's electrical system. Such
Position B represents the charged battery of
another vehicle or an equivalent starter pack.
damage will not be covered by the
Mercedes-Benz Limited Warranty.
Only use jumper cables with sufficient
R
cross-section and insulated terminal
clamps.
Always make sure the jumper cables are
R
not on or near pulleys, fans or other parts
that move when an engine is started or
running.
Should the battery be drained completely,
R
let the donating power source charge the
vehicle for several minutes before
reattempting the starting process.
The jump-start contacts are located in the
engine compartment on the passenger side.
X
Make sure the two vehicles do not touch.
X
Switch off all electrical consumers.
X
Engage the parking brake.
X
Make sure the automatic transmission is in
park position P.
X
Open the hood ( Y page 188).
X
Slide cover : from positive terminal = in
direction of arrow.