I'm about to send my second Band 2 back. The first had a bad battery, the second battery started better but is now even worse than the previous. I get only 22-24 hours out of it with minimal usage (that is: watch mode rotate on, activity reminder off, 6 different tiles, haptic & screen brightness to low, no gps usage).
And Josh I'm really treating it well... I just really don't get why a samsung gear s2 gets 3 days of usage without a HUGE battery block on your wrist, and my microsoft band hardly gets 1 day while I don't use the only difference between the two watches (gps).