·
A
lways read and observe the warnings
on the 12-volt vehicle battery.
·
Switch o the ignition and all electrical
consumers before carrying out any
work on the 12-volt vehicle battery and
also disconnect the negative cable
from the 12-volt vehicle battery.
·
Children should always be kept away
from electrolyte and the 12-volt vehicle
battery.
·
When working with the 12-volt vehicle
battery, ensure that your hands, arms
and face in particular are protected
from acid spillage.
·
Always wear eye protection and pro-
tective gloves.
·
Never short circuit battery terminals.
·
All work should be carried out by a suit-
ably qualified workshop.
WARNING
A highly explosive gas mixture is pro-
duc
ed when working on the 12-volt vehi-
cle battery. The gas emitted from the 12-
volt vehicle battery could be ignited by
sparks. This can result in severe or fatal
injuries.
·
Always keep fire, sparks, naked flames
and lit cigarettes away from the 12-volt
vehicle battery.
·
When handling cables and electrical
equipment, avoid generating sparks
and electrostatic discharge.
NOTICE
Ultraviolet radiation can damage the bat-
tery housing.
·
Do not expose the 12
-volt vehicle battery
to direct sunlight for an extended time.
NOTICE
The 12-volt battery can freeze and be de-
stroyed a
s a result.
·
Protect the 12-volt vehicle battery
against frost if the vehicle is le standing
for extended periods.
System settings aer battery replace-
ment
System settings may have been changed or
deleted if the 12-volt vehicle battery has
been replaced or aer jump starting.
1. Check the date and time and adjust if
necessary.
2. Check the personal convenience set-
tings and adjust and save if necessary.
Checking the electrolyte level of
the 12
-volt vehicle battery
Please refer to , and on page
326 and
and at the start of the
chapt
er on page 341.
The electrolyte level of the 12-volt vehicle
battery should be checked regularly in
high-mileage vehicles, in hot countries and
in older 12-volt vehicle batteries. The 12-volt
vehicle battery is otherwise maintenance-
free.
Preparations
1. Prepare the vehicle for working in the
bonnet space → page 328.
2. Open the bonnet
→ pa
ge 328.
Checking the electrolyte level (12-volt
vehicle batteries with battery window)
Fig. 210 Ba
ttery window on the top of the
12-volt vehicle battery (general guide).
Depending on equipment, it may be neces-
sary to remove an additional bracket in or-
der to view the battery window. An addi-
342
Checking and refilling