You can use either battery type, but there have been some fitment issues with flattops and Kicks. It really depends on the battery and topper used, but in some cases there isn't enough button
throw to fire the Nemesis without adding larger pins.
Really all you can do is try it. It will probably work flawlessly, but IF you run into a problem with getting things to fit right you can get larger replacement pins from someplace like Fat Daddy Vapes to fix it.