Battery discharge
If frequent short journeys are made, the vehicle battery does not recharge suf-
ficiently.
The battery capacity decreases at low temperatures.
If the vehicle is not used for longer than 3 to 4 weeks, disconnect the negative
terminal
of the battery or charge the battery completely with a very low
charging current.
Charging
Read and observe
and on page 148 first.
Only charge the battery when the ignition and all consumers are switched off.
Refer to the instructions of the charger manufacturer.
Charging
›
For vehicles withthe START-STOPsystem or aux. heating, connect the
ter-
minal of the charger on the battery’s pole, the
terminal of the charger to
the earth point of the engine » page 161.
›
For vehicles without the START-STOPsystem or aux. heating, connect the
charger terminals to the corresponding battery poles ( to
,
to
).
›
Plug the mains cable of the charger into the power socket and switch on the
device.
›
After charging has been successful: Switch off the charger and remove the
mains cable from the power socket.
›
Disconnect the terminals of the charger from the vehicle battery.
A charging current of 0.1 multiple of the total vehicle battery capacity (or low-
er) must be used until full charging is achieved.
WARNING■ When charging the vehicle battery, hydrogen is released - risk of explo-
sion. An explosion can be caused through sparking while unclamping or
loosening the cable plug.■
So-called“quick-charging” of the vehicle battery is dangerous and re-
quires a special charger and specialist knowledge. Therefore, have“Quick
loading” carried out by a specialist garage.
Disconnect/reconnect and change
Read and observe
and on page 148 first.
The new vehicle battery must have the same capacity, voltage, current and the
same size as the original Battery.
We recommend you have the battery replaced by a specialist garage.
›
To disconnect , switch off the ignition and disconnect the negative terminal
first
, then disconnect the positive terminal
.
›
When reconnecting the battery, reconnect the positive terminal
first, then
connect the negative terminal
.
After disconnecting and re-connecting the vehicle battery, the following func- tions or devices are partially or completely inoperative.
Function / deviceOperating measureWindows» page 55Panorama sliding/tilting roof» page 57Sun screen» page 57Time settings» page 39
CAUTION
■ Disconnect the battery only with the ignition and consumers turned off -
There is a risk of damaging the electrical system of the vehicle.■
Before disconnecting the battery, always close the electric windows and the
tilt/slide sunroof - otherwise the fitting units for these may malfunction.
■
Under no circumstances mix up the charging cables – There is a risk of fire.
Note
After disconnecting and reconnecting the vehicle battery, we recommend hav-
ing the vehicle checked by a specialist to ensure that the full functionality of
the vehicle is guaranteed.149Inspecting and replenishing
