Mercedes-Benz AMG GT Operator's Manual page 374

During starting assistance, always take
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care to connect only battery terminals of
identical polarity.
During starting assistance, observe the
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sequence described for connecting and
disconnecting the jump leads.
Do not connect or disconnect the bat-
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tery terminals with the engine running.
& WARNING Risk of explosion due to explo-
sive mixture of gases
An explosive mixture of gases can escape
from the battery during charging and starting
assistance.
Fire, naked flames, smoking and creating
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sparks must be avoided.
Make sure there is adequate ventilation.
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Do not stand over the battery.
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& WARNING Risk of explosion from a frozen
battery
A discharged battery may freeze at tempera-
tures slightly above or below freezing point.
During starting assistance or battery charging,
battery gas can be released.
Always allow a battery to thaw before
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charging it or performing starting assis-
tance.
If the indicator/warning lamps in the instrument
cluster do not light up at low temperatures, it is
very likely that the discharged battery has frozen.
In this case you may neither jump-start the vehi-
cle nor charge the battery.
The service life of a battery that has been thawed
may be dramatically shortened. The starting char-
acteristics may be impaired, especially at low
temperatures.
It is recommended that you have a thawed battery
checked at a qualified specialist workshop.
Breakdown assistance 371
Plug-in hybrid
If your vehicle has been started with starting
assistance, it may not be possible to use the elec-
tric drive for approximately 30 minutes.
Starting assistance is not considered to be a nor-
mal operating condition.
All vehicles
* NOTE Damage caused by numerous or
extended attempts to start the engine
Numerous or extended attempts to start the
engine may damage the catalytic converter
due to non-combusted fuel.
Avoid numerous and extended attempts
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to start the engine.
Observe the following points during starting assis-
tance and when charging the battery:
Only use undamaged jump lead/charging
R
cables with a sufficient cross-section and
insulated terminal clamps.
Non-insulated parts of the terminal clamps
R
must not come into contact with other metal