Thanks for posting your customer service experience with replacement parts.
Nothing against the USB Werk or Cinq5, but I bought a Sinewave Revolution about eight years ago. It is usually under a roof in rainy weather, but it has seen a few untimely downpours. It also saw about ten weeks of continuous outdoor use on a couple tours in rainy places. The revolution has outstanding waterproofing. It is the black box with a white label in the photo where it is attached to the handlebar bag bracket with a zip tie. In the photo, the USB port is on top, the red cable is plugged into it. Later I changed that, now put the USB port on the bottom so rain water does not collect in the port. It is less convenient on the bottom, I can't see the port when I am plugging a cable into it, but it only takes a few extra seconds to plug a cable into it.
Initially I strapped it to my top tube where I could plug things in with my left hand. Later changed that to my handlebar bag bracket which is much closer to anything I would want to plug into it, which usually is my pass through cache battery, or powerbank that is stored in the handlebar bag.
And looking close at the photo, there are a few drops of rain on everything.