Just had flat battery and AA man tested and told me needed new one so changed it . Came out this morning and totally flat again . Another AA man said something was draining it after testing it after 15mins . I noticed that red light was on middle heater control even though doors all locked . The car had been starting slowly for a while and not sure if this light was always on . Also cigarette lighter has not been working for a while and not sure if this is related . Any suggestions would be helpful.