The battery on these is in their film pack. Confirmation on this is in the manual located [http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000050240.pdf|here] and a video review of the camera [https://www.youtube.com/watch?v=7lsRgrFwKbE|here]. The direct answer to your question is change the film pack. A guide for how to change the film/battery pack is [guide|1987|here.] If the battery has gone bad in the film pack, some ways to work around that can be found [http://www.instructables.com/community/recharging-the-battery-in-a-polaroid-type600-film-/|here]. I had a lot of fun with Polaroid cameras when I was younger. Hope I've helped you. Good Luck.