Wow that's not bad! I didn't know there was a 305. or going to be. It needs to function well in the cold because I'm in Minnesota. I need regular batteries because sometimes I might be out for a weeks on end, not in the cold though. I also ran my first 10 miles on Saturday which was a major ego booster for me. I never thought that I'd ever run 10 miles. So I just wanna, uhm, reward myself!