I often charge both my iPhone and iPad off of the iPad adapter plugged into a wall. That charges the iPhone very quickly (especially the first part to get it to about 70%). I know that the iPad adapter is a little more powerful. Could there by any problem with charging an iPhone with it? I also sometimes trickle charge off of a USB hub plugged into my computer. That is a fairly slow process. So sometimes my iPhone is being force-fed energy and sometimes just a dribble. I haven't noticed any problems but I was wondering if there is any cause for concern.