Hello to everybody! I am new here I am a happy owner of a Sony Xperia Z. I am really satisfied and it has been two years since I bought it. In this moment, my Xperia Z has installed the build number 10.4.1.B.0.101, Android 4.3. I have never upgraded to newest Android's versions because everything has worked properly so far. I am undecided whether upgrade or not. My biggest and unique concern is battery life. My question is really simple: which is the best build my Xperia Z should be upgraded to in order to obtain the maximum battery life performance? Is it convenient to go for the 10.5.A.0.230 in terms of battery life? Thank you for your kind consideration. Francesco
