I just thought some people might like the warning so they don't scare themselves like I did. Either the Power Pak battery goes is supposed to screw down much tighter than the default 3DS back or it's easy to overtighten it, but I screwed it down hard enough to where my DSTwo barely went in and wouldn't come out. I found I had to loosen the screws slightly to get a good fit and still have the card pop out. It's on securely, even with them loosened somewhat. I didn't notice it with a normal game pak. Just making a note of it. *edit* On second thought....should this be in the Supercard section? I suppose it could be in either. I'll let a mod decide.