Hey guys, i dropped my iphone yesterday and the home button wouldnt work, after a few minutes it worked again. at night i charged it and i thought it was fully charged so i took it to school and when i looked at it it said 20% battery. When i got home i plugged it in it wouldnt charge or sync with itunes, i tried a wall charger, with no results, lastly i tried a icraig dock and it charged. What could be the problem here??? It will only charge on that dock.