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Practical hints
Batteries
Do not rub the battery with rags or cloths.
The battery could explode if touched due to
electrostatic charge or due to spark forma-
tion.
!
Switch off the engine and switch off the ve-
hicle's internal electrical functions ( page 637)
before you disconnect or remove the battery's
terminal clamps. You could otherwise destroy
electronic assemblies such as the generator.
Have the battery checked regularly by an autho-
rized Mercedes-Benz Center. Refer to Mainte-
nance Booklet for maintenance intervals or
contact an authorized Mercedes-Benz Center for
further information.
!
Do not connect any consumers directly to
the starter battery. The starter battery will other-
wise be discharged.
i
Only replace a discharged battery with a bat-
tery recommended by Mercedes-Benz. The con-
sumer battery is installed in the trunk in such a
way that it is safeguarded as much as possible
against mechanical destruction in the event of
an accident.
636
i
Remove SmartKey from starter switch (vehi-
cles with KEYLESS-GO*: Make sure the vehicle's
on-board electronics have status 0)
( page 315) when you turn off the engine and
no longer require any electrical consumers. The
vehicle then uses very little power and the con-
sumer battery is spared.
Starter battery (example illustration from
S 550)
1 Negative terminal
2 Positive terminal
i
If the consumer battery is discharged, you
must use the mechanical key to unlock the vehi-
cle ( page 614). Since the vehicle has a sepa-
rate starter battery, however, you can still start
the vehicle.
Disconnecting starter battery
!
Always disconnect the starter battery in the
order described below. You could otherwise
damage the vehicle's electronics.
!
Switch off the vehicle's internal electrical
functions before disconnecting the starter bat-
tery. If the vehicle is stationary for more than one
hour with the SmartKey removed, you do not
need to switch off the vehicle's internal electrical
functions.
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