In 10.2.1 the drain is almost the same as beta 6 , but on beta 6 it drops for example from 42 to 38 after you used it 1 min ago . I dont even know whos better , i still hope even after so many rollvacks that my phone goes back to its originally state . Its 4 months old onlyDo you mean to say 10.2.1 is better than 10.3 beta 6 in terms of battery performance, if yes how much is the difference.