Practical information
230
  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.  
Starting using another 
battery 
   Remove the plastic cover from the (+) terminal, if your vehicle has one.    Connect the red cable to the positive terminal (+) of the flat battery  A , then to the positive terminal (+) of the slave battery  B .    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). 
   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).    Start the engine of the vehicle with the good battery and leave it running for a few minutes.    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.    Wait until the engine returns to idle then disconnect the jump lead cables in the reverse order.    Refit the plastic cover to the (+) terminal, if your  vehicle  has  one.    
  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.