Has anybody else observed their battery not permanent anywhere near as long as, later than upgrading to 4.2.1? I completely charged my iPad and I have been utilizing it for about 3 hours currently, glow reading and browsing, and my battery by now is at 50%. I utilized to get days worth of common use from my iPad, but since upgrading to 4.2.1, I observe that the battery is not permanent anywhere near as long. Could it be to do with multitasking? The fact that the majority of applications are continue open in the background? Anybody else had similar experiences?