Yeah, it seemed like CM 10.1 was really doing a number on the battery life, even when i left the wifi turned off. I think it must have been frequently rebooting itself and getting stuck in the endless loop, drawing a lot of power. I'm definitely holding off awhile before trying that again.
so far I'm happy enough with the rooted HD, since I can use Playstore and Amazon apps. If hadn't been able to do this, I would have probably returned the Nook and gotten a different tablet, since the Nook app store is so pitifully empty.
I did run into a problem last night but it probably has more to do with my using Firefox's mobile browser for android than the Nook itself. I was trying to watch a video from pbs and it wouldn't play. I really dislike Nook's native browser (is it Chrome?) so I was hoping to use FF, but maybe just for this.