CITROEN DS5 Owner's Handbook Manual page 212

12 V battery
Procedure for starting the engine using another battery or charging a discharged 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 on the (+)
terminal,
if necessary, unclip the fusebox to remove
the battery.
Disconnecting the (+) cable
Raise the locking tab D fully to release the
cable terminal clamp E .
Reconnecting the (+) cable
Position the open clamp E of the cable on
the positive post (+) of the battery.
Press vertically on the clamp E to position
it correctly on the battery.
Lock the clamp by spreading the
positioning lug and then lowering the tab D.
Do not apply excessive force on the
tab as locking will not be possible if the
clamp is not positioned correctly; start
the procedure again.