PEUGEOT 3008 2015 Handbook page 282

In the event of a breakdown
If you wish to charge your vehicle's battery
yourself, use only a charger compatible
with lead-acid batteries with a nominal
voltage of 12 V.
Follow the instructions provided by the
manufacturer of the charger.
Never reverse polarities.
It is not necessary to disconnect the
battery.
F Switch off the ignition.
F Switch off all electrical consumers (audio
system, lighting, wipers, etc.).
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F Switch off charger B before connecting the
cables to the battery, so as to avoid any
dangerous sparks.
F Ensure that the charger cables are in good
condition.
F Raise the plastic cover, if your vehicle has
one, on the (+) terminal.
F Connect charger B cables as follows:
- the positive (+) red cable to the (+)
terminal of battery A,
- the negative (-) black cable to earth point
C on the vehicle.
F At the end of the charging operation, switch
off charger B before disconnecting the
cables from battery A.
If this label is present, it is essential to
use only a 12 V charger to avoid causing
irreversible damage to the electrical
components related to the Stop & Start
system.
Never try any charge a frozen battery -
Risk of explosion!
If the battery has frozen, have it checked
by a PEUGEOT dealer or by a qualified
workshop who will check that the internal
components have not been damaged and
that the container has not cracked, which
would mean a risk of toxic and corrosive
acid leaking.
Some functions, including Stop & Start,
are not available if the battery is not
sufficiently charged.
Disconnecting the battery
In order to maintain an adequate state
of charge for starting the engine, it is
recommended that the battery be disconnected
if the vehicle is taken out of service for a long
period.
Before disconnecting the battery:
F close all openings (doors, tailgate, windows,
sunroof),
F switch off all electrical consumers (audio
system, wipers, lighting, ...),