title: Calculating battery life in iOS
body: <p>Wondering if there are references beyond the Apple tech stats for calculating battery life. I've tried comparing some existing battery apps (battery % left * Apple's figures) and I dont come up with the same answers sometimes. Also there are stats for using 2G cell (as opposed to 3G) and I dont see anything on Apple for 2G battery life.</p>
  
  <p>Of course, some of the apps claim they are 'the most accurate'... but I dont see that happening unless someone has a source for very accurate stats.</p>