A cover for protecting a spare Nikon EN-EL15 (or compatible) battery based on a great cover by @PiJey_88387 enhanced to also cover a USB-C charging connector found on a Jupio EN-EL15C ULTRA C battery.
Printed in PETG with 0.2mm layer height at 100% (unlike the original model). The first few attempts to remove the cover from a battery might require gloves for having a good grip on the battery.
The third photo shows the original cover snapped on the Jupio battery with unprotected USB-C connector.
The author remixed this model.