Yeah, as a previous poster mention, rechargeable batteries sometimes won't re-charge if they have been fully drained. Also, I have some inexpensive radio triggers and a few 3rd party flashes. In general, for non-name brand electronics, I do not trust the "Off" switch.
Harrrrgnn, well, it's only two batteries and you never stop learning - thanks for the information. I'll adapt my behavior accordingly if I keep buying Chinese junk products, obviously the cheaper electronics do make a difference - I've never experienced with my Canon flashes.
I was going to suggest doing a deep cycle, but it looks like you got it fixed with the paper clip method.
As far as Chinese junk products; I guess everyone has their own opinions. I've read countless threads of people who can't get their Canon 600ex-RT $600 flash to even work with Eneloops. So I guess it's a matter of perspective. Third party electronics are never going to have the kind of QC that name brand electronics charging 4 - 10X as much will, it's simple electronics. But personally, I'm glad third party options exist to try to help keep the big guys in line.
FWIW, I leave batteries in RF-602, RF-622 and 560-TX transceivers all the time and never had a problem in any of the 15 or so units I have. I only take the batteries out of my flashes because I have a bunch and only consistently use 2 or 3 of them.