Camera no longer being powered by battery? can't take photos anymore.

My grandma handed me her Polaroid sun 600 LMS and I ordered film for it. It seemed to work fine for the first couple of days. Then I took it out with a friend for a day and after coming back it doesn’t seem like it has any power anymore. I had only gone through half of the film when this problem started. Idk if the heat of the day drained the battery or affected it somehow. I just wanna know what I can do to fix it. I also have another film packet, should I just take out the old one and see if the camera still works with the new packet?