There's no screws to quit, so u can put it apart from that sandwich is with a cutter, xacto, or a ninja knive (remember kids don't try this at home)

you can star on the glued unions of the Plastic like i show u in the picture.

Please be really careful (dont cut a lot or u may detroy the battery, or your own face)

I strongly recommend do this with the battery full or almost fully discharged.