Battery life based on minutes per day of reading time.
Amz (old): 1 month = 60 min/day = 30 hours
B&N (new): 2 months = 30 min/day = 30 hours
Amz (new): 2 months = 30 min/day = 30 hours
When Amazon releases the Kindle Touch later this year, I fully expect a 4 month battery life (15 min/day = 30 hours)