We bought Sanyo's and they ran about 60 min compared to the 70 on the Duracell, not worth the extra $ for 10 min. I have never used the Panasonic's. We use Energizers mostly now, since we bought them on sale at cheapbatteries
Well Zerox came through I got all 150 last week and have tested them out and they are great, they do have dates printed on them it is hard to see they are all 11-2008. Thanx Zerox that should last us about 6 to 8 months so if you can get more e-mail me about February.