Your battery behaviour sounds a bit suspect but pleased you got it working again.
I had a similar experience today too. I received a battery low warning and within a couple of seconds the screen went solid black with no message at all. I plugged it in to a USB port - no response, still a black screen and not detected by windows or ADE. I started to worry about as I couldn't get any response out of it - even the slider on/off did nothing, removing it from the USB, trying another one - nothing, a dead kobo.
But I decided to try a wall charger - which fixed everything. I got the pretty message saying my kobo was charging, it charged for a few hours and everything seems normal again. I just assumed that because the battery went so flat it wasn't even capable of charging through USB and needed more juice from AC power (no science in that statement at all!). So I am not going to let it go flat again, I don't like the black screen at all.
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