SRV

Hello forum I need your advice. I have my 2007 550i in the shop. They said that the battery has low voltage. I replaced a battery for this very issue 6 months ago. Obviously something is wrong. I noticed my cd songs even though the car is off. I think it is running. I don't know what else could be operational after the car is "off." your help is appreciated. Please share your experiances. I am afraid my deal will give me the run around.

Thanks