I have now 23% battery and 10h21 min of usage. To be honest - and my previous phone was an iPhone 4S - I was expecting a much better battery life... :-( I'm charging again with the phone powered off tonight, and I'm hoping things will improve after calibration. (what do you think ?). I forgot to mention that this is a European Razr Maxx (so, no 4G, only 3G).