Over the past few days I've been in a situation with lots of boring downtime so I've been using wireless to surf FaceBook. A LOT. In other words, non-stop.
I find that in about five hours, my phone is down to 35% whereas under non-use, it will stay above 90% all day.
Nice little object lesson: take your charger with you if you even suspect for a second that you'll be using the online features a lot.
--Wag--