I'm getting seriously browned off with the radio cutting out after about five or six minutes when the ignition is off. I do not believe for a second that the radio will seriously drain the battery. I ran my previous vehicle, a Rover 75, for ten years and I scrapped it with its original battery. The radio was sometimes played for hours at a time with the ignition off. Can anyone help me? I won't be renewing a four year old battery.