Phone has been off of charger for 1:01, and I've been using the internet most of that time on my home wi-fi. Display has used 93% of battery; been on for 38 minutes, and battery is still showing 100%. This is per "Battery Info" (created shortcut via Any Cut), which reports battery level in 1% increments. İ've had the phone for about 2 weeks, and the first 5-6 charges were full charge/discharge, bit have put it on a charger at various levels since. Previously, a half hour of web browsing would have drained about 10-15% "at least" (display at about 20% brightness the whole time via Quick Settings app). I'll continue to monitor...hopefully this performance will continue.