Operation Manual

427
Practical hints
Batteries
왔 Batteries
For more information on batteries, see
“Battery” (
컄 page 290).
Your vehicle is equipped with two
batteries:
앫 The starter battery
앫 The battery for electrical consumers
(consumer battery), located in the
trunk
The starter battery is located on the
right-hand side of the engine compart-
ment.
1 Positive terminal
2 Negative terminal
3 Battery ventilation
The consumer battery is located on the
right-hand side of the trunk.
4 Positive terminal
5 Negative terminal
!
The starter battery, its filler caps, and the
ventilation hose must always be securely
installed when the vehicle is in operation.
!
The consumer battery located in the trunk is
a valve-regulated lead acid (VRLA) battery, also
referred to as “fleece” battery. Such batteries do
not require topping-up of the electrolyte level.
VRLA batteries therefore do not have cell caps
and the battery cover is non-removable. Do not
attempt to open the consumer battery as other-
wise the battery will be damaged.
Even though VRLA batteries do not require top-
ping-up of the electrolyte level and cannot be
opened to check the electrolyte level, the bat-
tery condition must be checked periodically by
performing a battery conductance test. Refer to
Maintenance Booklet for battery condition test-
ing intervals.
As with any other battery, disconnect the con-
sumer battery if you do not intend to operate
your vehicle for an extended period of time to
prevent battery discharge or connect an acces-
sory battery charge unit expressly approved by
Mercedes-Benz for your vehicle model to main-
tain the battery charge. Contact an authorized
Mercedes-Benz Center for further information.