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Practical hints
Batteries
Switching off vehicle’s internal
electrical functions
̈ Turn off all electrical consumers.
̈ Turn SmartKey in starter switch to po-
sition 0.
̈ Turn SmartKey in starter switch to po-
sition 1.
̈ Wait for 30 seconds.
The vehicle’s internal electrical func-
tions are switched off.
̈ Turn SmartKey in starter switch to po-
sition 0.
Disconnecting starter battery
̈ Open the hood (୴ page 541).
̈ Use a 10-mm open-end wrench to dis-
connect the battery negative lead.
̈ Remove cover 2 (୴ page 694) from
the positive terminal.
̈ Disconnect the battery positive lead.
Removing starter battery
̈ Pull out the battery ventilation hose
from the battery (depending on battery
arrangement in your vehicle model, the
ventilation hose is located either on the
left or right side of the battery).
̈ Fold bar on starter battery up.
̈ Take out the starter battery.
Charging battery
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Vehicles with KEYLESS-GO: remove the
KEYLESS-GO button (
୴ page 345) and use the
SmartKey with KEYLESS-GO like a normal
SmartKey.
!
Do not remove the SmartKey!
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For your convenience, have the starter bat-
tery removed by a Mercedes-Benz Center.
Warning! G
Never charge a battery while still installed in
the vehicle unless the accessory battery
charge unit approved by Mercedes-Benz is
being used. Gases may escape during charg-
ing and cause explosions that may result in
paint damage, corrosion or personal injury.
An accessory battery charge unit specially
adapted for Mercedes-Benz vehicles and
tested and approved by Mercedes-Benz is
available, permitting the charging of the bat-
tery in its installed position. Contact an au-
thorized Mercedes-Benz Center for
information and availability. Charge battery
in accordance with the separate instruc-
tions for the accessory battery charger.
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Have the batteries charged by a
Mercedes-Benz Center. If you charge the batter-
ies yourself, follow the operating instructions for
your charging device.