Mercedes-Benz GLB 2023 Operator's Manual page 309

Observe this Operator's Manual.
If you do not intend to use the vehicle over an
extended period of time:
Activate standby mode.
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Connect the battery to a charger approved by
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Mercedes-Benz.
Consult a qualified specialist workshop to dis-
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connect the battery.
Notes on starting assistance and charging the 12
V battery
When charging the battery and during starting
assistance, always use the jump-start connection
point in the engine compartment.
* NOTE Damage to the battery due to over-
voltage
When charging using a battery charger without
a maximum charging voltage, the battery or
the on-board electronics may be damaged.
Only use battery chargers with a maxi-
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mum charging voltage of 14.8 V.
& WARNING Risk of explosion due to the
ignition of hydrogen gas
If there is a short circuit or sparks are created,
there is a danger of hydrogen gas igniting
when you charge the battery.
Make sure that the POSITIVE terminal of
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a connected battery does not come into
contact with vehicle parts.
Never place metal objects or tools on a
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battery.
When connecting and disconnecting the
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battery, always observe the sequence of
battery terminals described.
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 jumper cables.
Breakdown assistance 307
Do not connect or disconnect the bat-
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tery terminals with the engine running.
& WARNING Risk of explosion due to a mix-
ture of explosive gases
A mixture of explosive gases can escape from
the battery during charging and jump starting.
Fire, open flames, smoking and creating
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sparks must be avoided.
Make sure that there is sufficient ventila-
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tion.
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.