Yes you can totally change the batteries! Here are some instructions: 1. Turn the tumbler upside down and unscrew the little phillips screws for the batteries2. Remove the little plastic cover and remove the 3 LR44 batteries (be sure to take a pic or remember the battery orientation)3. Insert 3x new LR44 batteries in the proper orientation, add cover back to tumbler and tighten the screw finger tightThat's it and now your tumbler lights up as new!