Great article, made me explicitly aware of something I had at the back of mind as a web developer.

Another point that struck me is that when I briefly used Android more than a year ago, there was a nifty tool that showed which app drained what %-age of the battery. If I am having troubles with my battery life on Android, I am likely to uninstall (or not use) an app that consumes more than its fair share of the battery.

I haven't seen an equivalent statistics pane in iOS, I wonder whether Apple will introduce it at some point to encourage app developers to author more efficient apps.