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334 Maintenance and care
If the vehicle is equipped with an AGM battery
(fleece battery), observe the following notes:
the batteries are maintenance-free
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they do not need topping up with distilled
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water
Battery care
* NOTE Battery discharging due to leakage
currents
Dirty battery clamps and battery surfaces
cause leakage currents. This can lead to the
batteries discharging.
Always keep the battery terminal
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clamps and battery surfaces clean and
dry.
* NOTE Damage to the battery housing
due to improper cleaning
If you use cleaning agents containing fuel,
these corrode the battery housing.
Do not use cleaning agents containing
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fuel.
* NOTE Damage to the battery due to self-
discharging
If dirt gets into the battery cell, self-discharg‐
ing from the battery increases and the bat‐
tery may be damaged.
Only clean the battery with the cell caps
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screwed in.
Observe the following points on battery care:
lightly grease the undersides of the battery
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clamps with acid-resistant grease, otherwise
dirt can enter the battery cells
only use commercially-available cleaning
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agents to clean the battery housing
recharge batteries that are not in use with a
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no-load voltage of less than 12.4 V
Activating transport mode
Activating/deactivating
Transport mode includes a deactivation function
for various electrical consumers when the engine
is not running and it protects the batteries from
discharging when vehicles are parked for a long
time.
In transport mode, all functions which are also
deactivated in energy-saving mode are deactiva‐
ted.
Additionally, the following functions are deactiva‐
ted in transport mode:
Work lamps
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Cargo liftgate
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Charging management alternator
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Dipped beam (when the ignition is switched
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off)
Ignition (at level one after 15 minutes when
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the engine is switched off and no diagnostic
device is connected)
The following functions are not deactivated in
transport mode:
The 24 V sockets and the first switch for the
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non-MB body are not deactivated, depending
on the vehicle equipment
Vehicles with a connection point for the
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body manufacturer: the 12 V socket is not
deactivated
Press the hazard warning lights switch, the
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headlamp flasher and turn signal indicator
simultaneously for at least three seconds
within three seconds of switching on the igni‐
tion.
To activate: move the turn signal indicator
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down.
To deactivate: move the turn signal indicator
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up.
Active transport mode will be shown as a display
message when the ignition is switched on again.
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The use of transport mode is stored in the
vehicle along with the kilometre reading and
time of activation/deactivation.
Checking and charging the battery
Checking the battery charge level
If the vehicle is used predominantly for driving
short distances or is parked for a long period,
check the battery charge level more often.
Disconnect the batteries.
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Wait approximately eight hours.
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Measure the no-load voltage of the battery.
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If the no-load voltage of the battery is over
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12.6 V, reconnect the battery.
If the no-load voltage of the battery is under
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12.6 V, charge the battery separately.
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