I added a U-lock to protect my MiniST2 battery from theft and with that in place, the large enclosure box doesn't quite fit with the new controller. These controllers have gaskets from the factory, but I went ahead and applied RTV silicone seal to all the exterior seams and cable entry points (no disassembly, just on the exterior surfaces) just in case, although I never ride in wet weather and never even on wet surfaces if I can avoid it.
On the MiniST2, the controller is mechanically well-protected behind the battery and under the seat, so my only interest was a bit more weatherproofing.