Bosch E-Bike Parts
Bosch Battery Port Terminal Cover
£3.99
This is the little rubber terminal cover as featured on the Bosch Active / Performance frame mounted battery systems.
For Bosch systems from 2013-2016 (Works on some later models too). These only work on particular models with the frame mounted battery. Looks like this:-
Some particular brands will have their own integrated design. So make sure yours looks like the above to ensure correct fitment before ordering.