PEUGEOT RCZ Handbook page 168

STARTING USING ANOTHER BATTERY
When your vehicle's battery is discharged, the engine can be started
using a slave battery (external or on another vehicle) and jump lead
cables.
First check that the slave battery has a nominal voltage of 12 V
and a capacity at least equal to that of the discharged battery.
Do not try to start the engine by connecting a battery charger.
Do not disconnect the (+) terminal when the engine is running.
F Remove the plastic cover from the (+) terminal, if your vehicle has
one.
F Connect the red cable to the positive terminal (+) of the flat
battery A, then to the positive terminal (+) of the slave battery B.
F Connect one end of the green or black cable to the negative
terminal (-) of the slave battery B (or earth point on the other
vehicle).
F Connect the other end of the green or black cable to the earth
point C on the broken down vehicle (or on the engine mounting).
F Start the engine of the vehicle with the good battery and leave it
running for a few minutes.
F Operate the starter on the broken down vehicle and let the engine
run.
If the engine does not start straight away, switch off the ignition and
wait a few moments before trying again.
F Wait until the engine returns to idle then disconnect the jump lead
cables in the reverse order.
F Refit the plastic cover to the (+) terminal, if your vehicle has one.
Some functions are not available if the battery is not sufficiently
charged.
166