Mercedes-Benz S-Class 2013 Owner's Manual page 429

Battery (vehicle)
426
Particularly avoid fire, naked flames, creating
sparks and smoking. Ensure there is sufficient
ventilation while charging and jump-starting.
Do not lean over a battery.
G WARNING
Battery acid is caustic. There is a risk of injury.
Avoid contact with the skin, eyes or clothing.
Do not inhale any battery gases. Do not lean
over the battery. Keep children away from
batteries. Wash battery acid immediately with
water and seek medical attention.
G
WARNING
A discharged battery can freeze at tempera-
tures below freezing point. When jump-start-
ing the vehicle or charging the battery, gases
can escape from the battery. There is a risk of
an explosion.
Allow the frozen battery to thaw out before
charging it or jump-starting.
! Only use battery chargers with a maxi-
mum charging voltage of 14.8 V.
! Only charge the battery using the jump-
start connection point.
The jump-starting connection point is in the
engine compartment (
Open the bonnet.
X
Connect the battery charger to the positive
X
terminal and earth point in the same order
as when connecting the donor battery in
the jump-starting procedure
( page 428).
Y
Never charge the battery if it is still fitted to
the vehicle, unless you use a battery charger
which has been tested and approved by
Mercedes-Benz. A battery charger unit spe-
cially adapted for Mercedes-Benz vehicles
and tested and approved by Mercedes-Benz
is available as an accessory. It permits the
charging of the battery in its installed posi-
tion. Contact a Mercedes-Benz Service
Centre for information and availability. Read
page 428).
Y
the battery charger's operating instructions
before charging the battery.
If the indicator/warning lamps do not light up
at low temperatures, it is very likely that the
discharged battery has frozen. In this case
you may neither jump-start the vehicle nor
charge the battery. The service life of a bat-
tery that has been thawed may be reduced.
The starting characteristics may be impaired,
especially at low temperatures. Have the
thawed battery checked at a qualified spe-
cialist workshop.
i
Hybrid vehicles: if the battery charge is
sufficient, the high-voltage battery can also
supply the 12 V battery with energy. This
only happens if the battery charge of the
12 V battery requires this, e.g. after using
electrical consumers for an extended
period with the engine switched off. As the
on-board voltage is continuously moni-
tored this can also be performed when the
engine is switched off. The battery charge
of the 12 V battery and the on-board volt-
age are thereby kept stable for a longer
period.
Charging the high-voltage battery
when stationary
Only hybrid vehicles are equipped with a high-
voltage battery.
G
WARNING
Never leave the engine running in enclosed
spaces. The exhaust gases contain carbon
monoxide. Inhaling exhaust fumes consti-
tutes a health hazard and could lead to loss
of consciousness or even death.
! Only charge the high-voltage battery in
the "Charging when stationary" operating
mode. Do not connect a battery charger to
the high-voltage battery. Otherwise, the
vehicle's high-voltage electrical system
could be damaged.