Mercedes-Benz E 300 1996 Emergency Operation - Manual (Page 35)

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Therefore, we strongly recommend
that you have the battery charge
checked frequently, and corrected if
necessary, especially if you use the
vehicle less than approximately 200
miles (300 km) per month, 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.
Always disconnect the battery negative
lead first and connect last.
When removing and connecting the
battery, always make sure that all
electrical consumers are off and the key is
in steering lock position 0. The battery, its
filler caps, the vent tube and the opposite
plug must always be securely installed
when the car is in operation. During
removal and installation always protect
the disconnected battery positive (+)
terminal with the cover attached to the
battery.
While the engine is running the battery
terminal clamps must not be loosened
or detached, otherwise the generator
and other electronic components would
be damaged.
Notes:
After reconnecting the battery also
resynchronize the front seats, front seat
head restraints, the Express feature of
the power windows, and the Electronic
Stability Program (ESP) (see Power
seats, front, Head restraints, Power
windows, and Electronic stability
program in Index).
Battery Recycling
Batteries contain materials that can
harm the environment with improper
disposal.
Large 12 Volt storage batteries contain
lead.
Recycling of batteries is the
preferred method of disposal.
Many states require sellers of batteries
to accept old batteries for recycling.