re:
I have a Lumia 920, and I will probably consider myself a light user. On an average normal day, I would unplug my phone in the morning at 6:30am, go through the day making and receiving, at times, dozens of calls, dozens of texts, plus bouts of checking Instagram or some websites, and by the time I end the day at night when I plug it in, I have roughly 80% left. There have been times when I would use it lightly, just a few calls, and maybe Instagram a couple times, and I would end the day with 90+% battery left. If I play some games, I would have roughly 50% left. If I forget to charge the phone one night, that's okay, as I would find I have about 70% left in the morning when I find out I forgot lol.