Last night, I was reading on my opus, and it died on me. It was at 70% battery a day or two ago, so I didn't think that was a concern. When I tried to turn it on, it refused. Went to a black screen, then nothing.
While I hold the power button, though, the blue led was flashing at me. When I let the power button go, the flashing stopped.
I haven't had a chance to plug it in to see if it magically drained 70% of the battery over a couple of days, though. Does the flashing led mean "Yeah, you're just about out of juice, so I'm not starting up"?