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Philips Norelco BG2040 BodyGroom 7100 Battery
Note: the pictures make it look like it's the glass the comes loose from the body. In fact, it's the metal shell the comes off, while all of the electronics are attached to the face. To get it started, you have to dig your spudger in between the metal shell and the little plastic rim that goes around the glass. I found it easiest to start in the middle, below the volume buttons.
Unfortunately, it would be hard to find a cell battery this small. The original battery is 2" x 1 1/8" x 1/8". My samsung S3 battery is 2 1/2" x 2" x 3/16", so is far from fitting. If you were ok with shaving the molded battery holder down, you could probably fit one that's 2" x 1 1/2" x 1/4" or so (the thickness tolerance is hard to tell), but it would be a lot of work. I think I might just buy a speaker that has good battery reputation (i.e., NOT JBL).