Jump-Starting; Replacing The 12 V Battery - Mercedes-Benz SL 450 2019 Operator's Manual

ately with plenty of clean 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 maximum
charging voltage of 14.8 V.
!
Only charge the battery using the jump-
starting connection point.
The jump-starting connection point is in the
engine compartment.
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 charge the battery nor jump-
start the vehicle. The service life of a thawed-
out battery may be shorter. The starting char-
acteristics can be impaired, particularly at low
temperatures. Have the thawed-out battery
checked at a qualified specialist workshop.
Read the battery charger's operating instruc-
tions before charging the battery.
Open the hood.
X
Connect the battery charger to the positive
X
terminal and ground point in the same order

Jump-starting

For the jump-starting procedure, use only the jump-starting connection point in the engine com-
partment, consisting of a positive terminal and a ground point.
G
WARNING
Battery acid is caustic. There is a risk of injury.
Avoid contact with skin, eyes or clothing. Do not inhale any battery gases. Do not lean over the
battery. Keep children away from batteries. Wash away battery acid immediately with plenty of
clean water and seek medical attention.
as when connecting the donor battery in the
jump-starting procedure (

Replacing the 12 V battery

Observe the notes on the 12 V battery
( page 282).
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Mercedes-Benz recommends that you have
the 12 V battery replaced at a qualified spe-
cialist workshop, e.g. at an authorized
Mercedes-Benz Center.
If you want to replace the battery yourself,
observe the following notes:
Always replace a defective battery with a
R
battery which meets the specific require-
ments of the vehicle.
The vehicle is equipped with an AGM
(Absorbent Glass Mat) technology battery.
Full vehicle functionality is only guaranteed
with an AGM battery. For safety reasons,
Mercedes-Benz recommends that you only
use batteries which have been tested and
approved for your vehicle by Mercedes-
Benz.
Use detachable parts such as breather
R
hoses, angled connecting pieces or terminal
covers from the battery which is to be
replaced.
Make sure that the vent hose is always con-
R
nected to the original opening on the bat-
tery side.
Install existing or supplied cell caps to pre-
R
vent gases or battery acid from escaping.
Make sure that the detachable parts are
R
connected again in the same way.
Jump-starting
page 285).
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Z
285