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Battery
327
fore do not have cell caps and the battery
cover is non-removable. Do not attempt to
open the battery as otherwise the battery
will be damaged.
Even though VRLA batteries do not require
topping-up of the electrolyte level and can-
not be opened to check the electrolyte
level, the battery condition must be
checked periodically by performing a bat-
tery conductance test. Refer to Mainte-
nance Booklet for battery condition testing
intervals.
The factory-equipped VRLA battery is leak-
proofed. Only use a battery as replacement
that has the same security features and is
of identical size, voltage, and capacity as
the factory-equipped battery.
!
As with any other battery, have the bat-
tery disconnect at a qualified workshop or
an authorized Mercedes-Benz Center if you
do not intend to operate your vehicle for an
extended period of time to prevent battery
discharge. You may also connect an acces-
sory battery charge unit expressly
approved by Mercedes-Benz for your vehi-
cle model to maintain the battery charge.
Contact an authorized Mercedes- Benz
Center for further information.
The battery, the battery ventilation hose
and the lateral plug must always be
securely installed when the vehicle is in
operation.
!
Never loosen or detach battery terminal
clamps while the engine is running or the
SmartKey is in the starter switch or KEY-
LESS-GO button is in position 1. Otherwise
the alternator and other electronic compo-
nents could be severely damaged.
Have the battery checked regularly at an
authorized Mercedes-Benz Center.
Refer to Maintenance Booklet for mainte-
nance intervals or contact an authorized
Mercedes-Benz Center for further informa-
tion.
i
Only replace a discharged battery with a
battery recommended by Mercedes-Benz.
i
After battery power was interrupted, do
the following:
R
Synchronize the ESP
®
(Y page 257).
R
Synchronize the power windows
(Y page 108).
Charging the battery
G
Warning!
Never charge a battery while still installed
in the vehicle unless the accessory battery
charge unit approved by Mercedes-Benz is
being used. Gases may escape during
charging and cause explosions that may
result in paint damage, corrosion or per-
sonal injury.
An accessory battery charge unit specially
adapted for Mercedes-Benz vehicles and
tested and approved by Mercedes-Benz is
available, permitting the charging of the
battery in its installed position. Contact an
authorized Mercedes-Benz Center for infor-
mation and availability.
Charge battery in accordance with the sep-
arate instructions for the accessory battery
charger.
Have batteries charged at an authorized Mer-
cedes-Benz Center. If you charge the batter-
ies yourself, follow the operating instructions
for your charging device.
Only use a battery charge unit with a maxi-
mum charging voltage of 14.8 V.
Practical hints
Z