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.
I designed a holder for the nice!nano and the battery. Now I only need to find a i/o switch which fits to the TRS hole. Wire everything up and try to get the ZMK right.
I have already wired the switches. Guided by Scotto's videos. It's a 5x4 matrix with no keys on the bottom row on 1,2,9,10. There are similar shields for the zmk firmware. My problem lies in the identification of row/column to pin connection.
That's an nice idea. My dream would be something like this , but for the nicenano. It also should hold a battery. However, haven't designed anything yet.
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.