You mean this one? I found that, but it was part of the kit I didn’t want to use. Also I missed the opportunity when somebody sold some on them on the discord channel. By now I designed a 3d printed tray, which holds 401430 LiPos (they do not fit below the nice!nano, but I cannot find 301230 for sale). Next step will be the wiring and before that I will have to figure out the pinout part.
Oh, I missed that one. Thanks. However, I designed my own one. Since my design has a pocket for the battery I think I will stick to it.