Lze vytisknout na 3D tiskárně...
https://www.stlfinder.com/model/battery-holder-for-mobile-phone-battery-bl-5c-x7D57OsR/184509/
Nebo zbastlit na koleně...
https://ripitapart.com/2014/06/17/a-temporary-hold-creating-li-ion-battery-holders-with-prototype-boards-and-pin-headers/2014-06-17-04-14-48/
Nebo objednat hotové....
https://www.bestarduino.com/p2173/BL-5C-Nokia-Battery-Holder-Case.html