Cover for battery contacts @e-bike

My place of work is five kilometers away. This is an ideal distance for an e-bike.
Unfortunately there is no possibility to park the bike under a roof.
At the moment I leave the battery on the bike during the day - but as soon as it gets colder I will take it into the office.
And so that the contacts are not exposed to the weather for 9 hours a day, I built this thing.