I use a Nexus 4. I listen to podcasts via bluetooth headset while doing chores; that's several hours on the weekends, and about one hour during weekdays. When I drive, I'm playing podcasts and using Waze (which uses GPS and Wireless networking and the screen is constantly on); that's about 1 hour/day. WiFi is constantly on and I use it to read e-mails and other social messages. I also use it for reading books (Safari To Go) throughout the day. It always lasts through the day with this behavior. I typically only plug it in on my bedstand when I go to bed, and unplug it in the morning when I get up. The only time I find I need to plug it in separately is when I watch some Netflix videos.

I recently destroyed the screen on my phone making it not possible to interact with it, so I've removed the sim and put it in a cheap feature phone. It still connects to WiFi (can't turn it off if I wanted to) and it beeps to let me know I have an e-mail. I can still listen to podcasts because my podcatcher automatically downloads and queues episodes and my headset has playback controls, and I have been using it for that purpose as much as I always have. Now when I go to bed, the battery icon has only the tiniest sliver empty; I expect it would last at least 4 days without plugging it in.

I think that it's safe to say Android OS is not draining my battery.