Long story short, i left my son in my civic 2004 type r, went into shops leaving ignition on so radio stayed on.Came out went to start car and it was dead...ignition lights up but nothing on final turn of key, my son says he was only playing with window switch while i was out.

Help, what has he done?

 

How old is the battery what is the voltage?

 

jumper cables, then replace battery....