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378 Breakdown assistance
Starting assistance and charging the 12 V
battery
Vehicles with a lithium-ion battery
When charging the battery and during start‐
#
ing assistance, always use the jump-start
connection point in the engine compartment.
* NOTE Damage to the battery from over‐
voltage
When charging using a battery charger with‐
out a maximum charging voltage, the battery
or the on-board electronics may be damaged.
Only use battery chargers with a maxi‐
#
mum charging voltage of 14.4 V.
* NOTE Shortening the service life of the
battery by charging the battery at low
temperatures
Charging the battery at very low tempera‐
tures may shorten the service life of the bat‐
tery and have a negative effect on starting.
Do not charge the battery at very low
#
temperatures.
All other vehicles
When charging the battery and during start‐
#
ing assistance, always use the jump-start
connection point in the engine compartment.
* NOTE Damaging the battery through
overvoltage
When using a battery charger without a maxi‐
mum charging voltage, the battery or the
vehicle electronics may be damaged.
Only use battery chargers with a maxi‐
#
mum charging voltage of 14.8 V.
& WARNING Risk of explosion from hydro‐
gen gas igniting
A battery generates hydrogen gas during the
charging process. If there is a short circuit or
sparks start to form, there is a danger of the
hydrogen gas igniting.
Make sure that the positive terminal of
#
the connected battery does not come
into contact with vehicle parts.
Never place metal objects or tools on a
#
battery.
When connecting and disconnecting the
#
battery, you must observe the descri‐
bed order for the battery clamps.
When giving starting assistance, always
#
make sure that you only connect bat‐
tery terminals with identical polarity.
During starting assistance, you must
#
observe the described order for con‐
necting and disconnecting the jump
lead.
Do not connect or disconnect the bat‐
#
tery clamps while the engine is running.
& WARNING Risk of explosion during
charging process and starting assistance
During the charging process and starting
assistance, the battery may release an explo‐
sive gas mixture.
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