I ordered some new and high quality 18650 batteries for use in my game light. Well...heck...I didn't know or notice that they make both a flat top and a button top version. I need the button top and now own 4 of the flat top type. I ordered and have gotten some new button top type, but wonder if there's anything I can use the flat top type in. They make the flat top ones, so there has to be a purpose.