I bought the extended battery...typically get 15-20 hours depending on use. Yesterday, I decided to turn off data, just to see how long the battery would last. I went through the whole day with minimal battery drain and basically calculated it out to getting 35-40 hours on the battery. Sweet...perfect to know for when I have a long day away from the charger and I know I'll be getting a lot of calls and text. So today I turn my data back on. After 9 hours of the phone being on, I'm only down 20%...putting me back at 45 hours on the charge after a simple calculation. 1) Did it refresh something to where I'm getting a better battery life? 2) Did it mess up my battery meter and it's saying I have more than I have? I checked the battery life by 3 different means and they were all the same. 3) Did it do something with all my syncing and nothing is syncing now? I haven't gone digging through all the apps, but everything seems normal. So what gives? 20 hours....turn off data and get 40 hours....turn data back on and still get 40 hours.