Mercedes-Benz GLB 2023 Operator's Manual page 310

308 Breakdown assistance
If the indicator/warning lamps on 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
#
to start the engine.
Observe the following points during starting assis-
tance and when charging the battery:
Only use undamaged jumper cables/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
parts while the jumper cable/charging cable
is connected to the battery/jump-start con-
nection point.
The jumper cables/charging cables must not
R
come into contact with any parts that may
move when the engine is running.
Always make sure that neither you nor the bat-
R
tery is electrostatically charged.
Keep away from fire and naked flames.
R
Do not lean over the battery.
R
Observe the additional following points when
charging the battery:
Only use chargers tested and approved for
R
Mercedes-Benz.
Read the charger's operating instructions
R
before charging the battery.
Observe the additional following points during
starting assistance:
For starting assistance, only use batteries with
R
a nominal voltage of 12 V.
The vehicles must not touch.
R
Gasoline engines: only accept starting assis-
R
tance if the engine and exhaust system are
cold.
Starting assistance and charging the 12 V battery
Requirements
The vehicle is secured with the electric park-
R
ing brake.
Automatic transmission: the transmission is in
R
position j.
The vehicle and all electrical consumers are
R
switched off.
The hood is open.
R