So my mom just recently upgraded to the 6 plus and decided to give me her old iphone 5. It was still on ios 7 when i got it and decided to upgrade it to ios 8.3 when she handed it on me. Now what i notice is that when i plugged it on the socket for the first attempt, it will take 2-3 seconds before it lights up but when i unplug it and plug it again, its quick. I dont think this has ever happened before. This was actually my first encounter to this problem(except when i plug it into my itunes which i think is normal) this has not happened with my ipad mini 3 though. I dont know whats going on,p.. i also tried reset the phone and it doesnt have a charging delay.. just for a little while then when u re plug it after few hours, it has delay again.