Thanks Lee, that's what I was looking for. I figured there had to be some discussion here on TS, but my searches with "rb-270" and other specific terms were coming up with nothing, and the more generic ones were getting way too many results to sift through.
Interesting, because I always assumed it was best to fully drain these before recharching (WRONG!).
So it sounds like the "40%" rule applies right away, and since I'm probably at 80-90% right now, I should just record the show tomorrow and that would bring me down to a good level for storage.