CITROËN DS5 Owner's Handbook Manual page 206

12 V battery
Procedure for charging your battery when it is flat or for starting the engine using another battery.
The presence of this label indicates
the use of a 12 V lead-acid battery with
special technology and specification, for
which the involvement of a CITROËN
dealer or qualified workshop is required
when replacing or disconnecting the
battery.
Failure to observe this recommendation
may cause premature wear of the
battery.
Access to the battery
The battery is located under the bonnet.
To gain access to it:
open the bonnet using the interior release
lever, then the exterior safety catch,
remove the plastic cover to gain access to
the two terminals,
unclip the fusebox to remove the battery,
if necessary.
Disconnecting the cables
Raise the locking tab fully.
Reconnecting the cables
Position the open clip 1 of the cable on the
positive terminal (+) of the battery.
Press vertically on the clip 1 to position it
correctly against the battery.
Lock the clip by spreading the positioning
lug and then lowering the tab 2.
Do not force the tab as locking will not
be possible if the clip is not positioned
correctly; start the procedure again.