You’re more than likely well aware of this fact, but music plays a huge part in Marvel’s Guardians of the Galaxy. Star-Lord’s “Awesome Mix Volume 1” is a key emotional piece of the protagonist’s story, and classic songs are used to great effect throughout the film. But it’s also caused a great deal of controversy among the more nitpicky fans out there. See, Peter Quill frequently listens to the tape his mother gave him on a Walkman, and people question how a set of AA batteries have managed to last 26 years in deep space and apparently show no sign of slowing down. If this gives you pause, don’t worry, director James Gunn has an explanation for you.
Even if that backpack Quill is wearing when he’s taken from Earth was stuffed full of nothing but batteries, with the frequency uses his Walkman, his stockpile would be running low. More than that, I would be more concerned about the integrity of that tape. I’ve found old cassettes of mine that were nowhere near that old or that well worn, and lets just say the sound quality is not quite what it once was. But I feel like Gunn’s answer, provided on his Facebook page, works pretty well for both of these issues.