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Practical hints
Battery
Charging and reinstalling battery
̈ Charge battery in accordance with the
instructions of the battery charger
manufacturer.
̈ Reinstall the charged battery. Follow
the previously described steps in
reverse order.
Reconnecting the battery
̈ Turn off all electrical consumers.
̈ Remove SmartKey from starter switch.
Vehicles with KEYLESS-GO*:
̈ Press the start/stop button until
the engine shuts off.
̈ Open the driver’s door.
̈ Connect the battery positive lead and
fasten its cover 2.
̈ Connect the battery negative lead.
̈ Reinstall the filter box (୴ page 420).
Batteries contain materials that can harm
the environment if disposed of improperly.
Large 12-volt storage batteries contain
lead. Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.
Warning! G
Never charge a battery while still installed in
the vehicle. Gases may escape during charg-
ing and cause explosions that may result in
paint damage, corrosion or personal injury.
!
NEVER invert the terminal connections!
!
The battery, its filler caps and the vent
tube must always be securely installed
when the vehicle is in operation.
i
The following procedures must be car-
ried out following any interruption of
battery power (e.g. due to reconnect-
ing):
ț Set the clock (୴ page 151) (vehi-
cles with COMAND*: see COMAND
operator’s manual).
ț Resynchronize the side windows
(
୴ page 250).
ț Resynchronize the tilt/sliding
sunroof* (
୴ page 254).