The in use doesn't mean it's running. It shows percentage of battery drain over time. The background info also is over a period of time. It doesn't mean it's running when you check this screen. The reporting time frame is adjustable. IE is a big battery hog on this phone, but I think a lot of it is just the screen being on for a long period of time while browsing. Using IE, I expect the battery to be down a good 20 percent after an hour's worth of browsing.