Mercedes-Benz M-Class Owner's Manual page 349

Battery
346
Disconnecting the battery
! Always disconnect the battery in
the order described below. Never swap the
terminal clamps. You may otherwise dam-
age the vehicle electronics.
In vehicles with automatic transmission,
the transmission is locked in position P
after disconnecting the battery. The vehicle
is secured against rolling away. You can
then no longer move the vehicle.
Positive terminal
:
Battery
;
Negative terminal
=
Loosen the negative terminal clamp on the
X
battery and remove it.
Remove the cover from the positive termi-
X
nal clamp.
Loosen the positive terminal clamp on the
X
battery and remove it.
Removing/fitting the battery
To remove: disconnect the battery
X
( page 346).
Y
Remove breather hose :.
X
Loosen bolts ; on bracket =, which holds
X
the battery in place.
i
For this, you will need a 13 mm socket
wrench with an extension that is at least
30 cm long. This tool is not included in the
vehicle tool kit.
Remove bracket =.
X
Lift battery ? at the side until the lower
X
edge is free.
Pull out battery ? in the direction of the
X
arrow.
To fit: follow the steps described in "To
X
remove" in reverse order.
Reconnecting the battery
! Always connect the battery in the order
described below. Never swap the terminal
clamps. You may otherwise damage the
vehicle electronics.