Mercedes-Benz GLA Series Operator's Manual page 257

Keep away from fire and open flames.
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Do not lean over the battery.
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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:
For starting assistance, only use batteries
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with a nominal voltage of 12 V.
The vehicles must not touch.
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Gasoline engine: Only accept starting assis‐
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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‐
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ing brake.
Automatic transmission: The transmission
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is in position j.
The ignition and all electrical consumers are
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switched off.
The hood is open.
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Breakdown assistance 255
Slide cover 1 of positive clamp
#
jump-starting connection point in the direc‐
tion of the arrow.
Connect positive clamp 2 on your vehicle to
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the positive pole of the donor battery using
the jumper cable/charging cable. Always
begin with positive clamp 2 on your own
vehicle first.
During starting assistance: start the
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engine of the donor vehicle and run at idle
speed.
Connect the negative pole of the donor bat‐
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tery and ground point 3 of your own vehicle
by using the jumper cable/charging cable.
Begin with the donor battery first.
During starting assistance: start the
#
engine of your own vehicle.
During the charging process: start the
#
charging process.
During starting assistance: let the engines
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run for several minutes.
During starting assistance: before discon‐
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necting the jumper cable, switch on an elec‐
2 on the