Mercedes-Benz AMG GT Operator's Manual page 333

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.
* 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 jumper cable/charging
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cables with a sufficient cross-section and
insulated terminal clamps.
Non-insulated parts of the terminal clamps
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must not come into contact with other metal
parts while the jumper cable/charging cable
is connected to the battery/jump-start con-
nection point.
The jumper cable/charging cable must not
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come into contact with any parts that may
move when the engine is running.
Always make sure that neither you nor the bat-
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tery is electrostatically charged.
Keep away from fire and open flame.
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Do not lean over the battery.
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Make sure that the POSITIVE terminal of a
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connected battery does not come into contact
with vehicle parts.
Never place metal objects or tools on a bat-
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tery.
Breakdown assistance 331
When connecting and disconnecting the bat-
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tery, always observe the sequence of battery
terminals described.
Observe the additional following points when
charging the battery:
Only use battery chargers tested and
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approved for Mercedes-Benz.
Read the battery charger's operating instruc-
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tions before charging the battery.
Observe the additional following points during
starting assistance:
Starting assistance may only be provided
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using vehicles, batteries or other jump start
devices with a nominal voltage of 12 V.
The vehicles must not touch.
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Take care to connect only battery terminals of
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identical polarity.
Observe the sequence described for connect-
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ing and disconnecting the jumper cables.
Vehicles with a gasoline engine: jump-start the
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vehicle only when the engine and exhaust sys-
tem are cold.