2007 Mustang Battery issues

A mechanic diagnosed the radio as draining the battery. Yet at times it still grinds a bit before starting. I am going to let it sit for 3 days then try to start again. 2 questions, does anyone have a replacement radio for a 2007 radio and has anyone else has this issue? I hate to think I paid $359 for nothing.

User state: Valid

No matching spam trigger logs were found.