Mercedes-Benz S350 TURBODIESEL Operator's Manual page 102

Battery
The maintenance-free battery is located
in the trunk under the right-hand wheel
well cover panel.
The service life of the battery is
dependent on its condition of charge.
The battery should always be kept
sufficiently charged, in order to last an
optimum length of time.
Therefore, we recommend that you
have the battery charge checked
frequently if you use the vehicle
mostly for short distance trips, or if
it is not used for long periods of time.
Only charge a battery with a battery
charger after the battery has been
disconnected from the vehicle electrical
circuit.
When removing and connecting the
battery, always make sure that all
electrical consumers are off and the
key is in steering lock position 0.
While the engine is running the battery
terminal clamps must not be loosened or
detached, otherwise the alternator and
other electronic components would be
damaged.
Battery Recycling
Batteries contain materials that can
harm the environment with improper
disposal.
Large 12 Volt storage batteries contain
lead, and smaller watch-type batteries
(such as in the Infrared Remote Control
Unit) may contain mercury.
Recycling of batteries is the preferred
method of disposal.
Many states require sellers of batteries
to accept old batteries for recycling.
Warning!
Never lean over batteries while
connecting, you might get injured.
Battery fluid contains sulfuric acid.
Do not allow this fluid to come in
contact with eyes, skin or clothing.
In case it does, immediately flush
affected area with water and seek
medical help.
A battery will also produce hydrogen
gas, which is flammable and
explosive. Keep flames or sparks
away from battery, avoid improper
connection of jumper cables,
smoking etc..
102