Now that most of us have had our CoRes and enough weather to get out how is everyone doing on battery life? I got 36 to 40 hours on the first set (the ones that came with the machine) pretty dang impressive. I am now using Enelope rechargeables and am around 8 hours in on them with no sign of letting up yet. I would have had more info but I mistakenly put in my backups they lasted 15 hours or so but I don't remember what they had on them from before.