CITROËN DS5 Owner's Handbook Manual page 208

The batteries contain harmful substances
such as sulphuric acid and lead. They
must be disposed of in accordance
with regulations and must not, in any
circumstances, be discarded with household
waste.
Take used remote control batteries and
vehicle batteries to a special collection point.
It is advisable to disconnect the 12 V
battery if the vehicle is to be left unused
for more than one month.
Do not reverse the polarity and use only
a 12 V charger.
Do not disconnect the terminals while
the engine is running.
Do not charge the batteries without
disconnecting the terminals first.
Do not push the vehicle to start the
engine if it is fitted with the 6-speed
electronic gearbox system or an
automatic gearbox.
Before disconnecting the battery
Wait 2 minutes after switching off the ignition
before disconnecting the 12 V battery.
Close the windows and the doors before
disconnecting the battery.
Following reconnection of the
battery
Following reconnection of the 12 V battery,
switch on the ignition and wait 1 minute before
starting to permit initialisation of the electronic
systems. However, if problems remain following
this operation, contact a CITROËN dealer or a
qualified workshop.
Referring to the corresponding section, you
must yourself reinitialise:
- the remote control key,
- the panoramic sunroof blind,
- the GPS satellite navigation system.
Load reduction mode
System which manages the use of certain
functions according to the level of charge
remaining in the battery.
When the vehicle is being driven, the load
reduction function temporarily deactivates
certain functions, such as the air conditioning,
the heated rear screen...
The deactivated functions are reactivated
automatically as soon as conditions permit.