Mercedes-Benz SLS-Class 2013 Owners Manual - Manual (Page 243)

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 jumper cables which have a sufficient cross-section and insulated terminal clamps.
R 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 battery slightly.
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 such as the V-belt pulley or the fan.
These parts move when the engine is started and while it is running.
X Press the electric parking brake handle.
X Shift the transmission to P with the button in the center console.
X Remove the SmartKey from the ignition lock.
X Switch off all electrical consumers (e.g. radio, blower, etc.).
X Open the hood (
Y
page 214).
Position number B identifies the charged battery of the other vehicle or an equivalent jump-
starting device.
X Slide cover A of positive terminal : in the direction of the arrow.
X Connect positive terminal : on your vehicle to positive terminal ; of donor battery B
using the jumper cable, beginning with your own battery.
X
Start the engine of the donor vehicle and run it at idling speed.
Jump-starting
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