The file 'DJI Spark Battery Cradle For Universal USB Charger Converter 3D Printer Model' is (stl) file type, size is 37.9KB.
Cradle that's can hold DJI Spark battery in place while charging for Universal USB Charger Converter
https://www.aliexpress.com/store/product/KEBIDU-Universal-USB-Aerial-Camera-UAV-Charger-Converter-5V-3A-Fast-Charger-Drone-Battery-Charger-For/3378049_32852298421.html