PEUGEOT 508 Handbook page 237

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 to 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, etc.),
F switch off the ignition and wait for four
minutes.
At the battery, it is only necessary to
disconnect the (+) terminal.
Quick-release terminal clamp
Disconnecting the (+) terminal
F Raise the lever A fully to release the
clamp B.
F Remove the clamp B by lifting it off.
In the event of a breakdown
Reconnecting the (+) terminal
F Raise the lever A fully.
F Refit the open clamp B on the (+) terminal.
F Push the clamp B fully down.
F Lower the lever A to lock the clamp B.
Do not force the lever as locking will not
be possible if the clamp is not positioned
correctly; start the procedure again.
Following reconnection
After reconnecting the battery, turn on the
ignition and wait 1 minute before starting
the engine, in order to enable the electronic
systems to initialise.
However, if minor problems persist following
this operation, contact a PEUGEOT dealer or a
qualified workshop.
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