CITROEN Berlingo Electric Handbook page 28

Staring using an external slave
battery
- Lift the protective cover from the (+)
terminal,
Ensure that the slave battery is a
12 volt battery.
- connect one end of the red cable to
the ( + ) terminal of the discharged
vehicle battery, then the other end
to the ( + ) terminal of of the slave
battery,
- connect one end of the green or
black cable to the ( - ) terminal of the
slave battery,
- connect the other end of the green
or black cable to a ( - ) earth point on
your broken down vehicle.