I currently own an iPhone 4 running 4.2.1. It's been a while since I have considered updating to a more recent version. Now that iOS 5 has been released and has had time to mature, I would like to try it out. However... With the amount of complaints I see about battery life dropping 10% every hour compared to 2/3% on iOS 4, I don't know if I should. Is everyone experiencing this and are there ways to avoid battery drainage issues?