Lot's of tail light discussion, I know. I just read a very informative thread, but I wanted to hit this angle specifically.

My Planet Bike Superflashes have finally, sort of, died. One seems to be entirely dead, the other works fine when dry but behaves erratically in the rain. And really, I'm more concerned about a working tail light in the rain than any other time, so, more than outshining the SuperFlash, a rain-proof light is my number one priority.

Coming from my PB light, I am tempted by the Radbot, because I will already have the mounts on the my bike racks, and will be able to continue to do my other practice of clipping the light on to my trunk bag so that it always goes in the building with me an can be used on the bike that has no mount currently (but which often has a trunk bag). How is it for waterproofness?

I also read a lot positive about the Cygolite Hotshot. I don't see anything about a clip, and do see info about it being more focused and less effective if not mounted right, so I'm guessing that it wouldn't be great if I tried to attach it to the loop on my trunk bag, but might be fine with a rack mount. I just need to remember to bring it in. If it can stand up to plenty of rainy weather, that is.

I'm also open to any other options, but my main concerns are how it stands up in the rain and battery life.