Muli (E-bike) battery rain cover/ Shimano BT-E8010

Would appreciate your make, a like and/or voting ;-)

The wonderful Muli cycle carrier bike (https://muli-cycles.de/de/bikes/motor) has one weak point.

When the bike is set out to rain/ wet weather-conditions, water tends to stay in the battery compartment.  When putting the battery back in the e-motor does not work as water stays around the contacts

This part should be available as rubber cover by the producer, but isn't. This version v1.6 is the best fitting PLA testprint and worked fine even in heavy rain. Recommend PETG.

Also fits on other bikes with a Shimano BT-E8010 like the omni.