shimano EP8 akku mount rain cover for open contacts bullitt cargo bike

In winter time when charging the akkupack of my bullitt EP8 sometimes the open contact of the mount were flooded during rain - in the morning when I placed the powerpack the electronics promted an error during short-circuit fail. So I designed a little raincover for the open contacts to prevent flooding. I added a ring holder to permanently left it on the bike when the powerpack is mounted. 
In winter time I use to store the powerpack indoor cause the low temperature weaken the lifetime.

feel free to left your makes and improvements.

the model is printed upside down

0.4 nozzle @ 0.2mm

for now I used just matte PLA but every other material would work as well