Mercedes-Benz GLK 300 4MATIC 2012 Owner's Manual page 343

Battery (vehicle)
340
! Only charge the battery using the jump-
start connection point.
The jump-starting connection point is in the
engine compartment (
Open the bonnet (
X
Connect the battery charger to the positive
X
terminal and earth point in the same order
as when connecting the donor battery in
the jump-starting procedure
( page 341).
Y
Read the battery charger's operating
X
instructions before charging the battery.
page 341).
Y
page 313).
Y