How do I turn off the Economy mode on my Citroen C4 Grand Picasso exclusive?

[DeanLuke]

In 2007 my dad bought a brand new Citroen C4 Picasso Exclusive.
Its a great car, however, when the engine is turned off, and your listening to the radio, after about five minuets the radio goes off and the "economy mode" comes on. To turn off the economy mode you have to start the engine and turn it off again. How do I turn off the economy mode completely, without having to switch on the engine?

 

[Timboishere]

You cannot - it is there to protect the battery and once a certain voltage is reached it will trigger economy mode.

 

[shark shark boy]

you can not it happened to my mum's car i was shore it had something wrong with the battery we are going to
change it i will come back and tell you how it ends