OK, I have the OTA2 installed but really don't think this is due to that. Occasionally there will be a system process that sucks the life out of my battery. This morning I woke it up to find the system bar was missing and the screen would dim almost immediately. No biggy as I just turned it off and back on. Screen would still dim but the system bar was back and I found the battery at 6%. Still not a big deal, so I thought, I would just put it to sleep until I can get it to a charger. However, it kept waking up, display I had a low battery and then go back to sleep. It would cycle through this about 4 times a minute and I could not get it to stop doing this.
Basically, once the battery hits a certain level it would appear it will cycle itself till the battery is fully discharged.