so my iphone 4 goes from the need to charge svreen, the large battery with the little red saying it need to be plugged in. i do so and i wait a little then the phone powers up. then during the process it turns off and says it needs to be plugged in again. i have tried multiple different outlet and cords combinations. i have tried numerous cords and outlets. i have even plugged it in to my mac and pulled up itunes and my phone cant be detected and wont connect to itunes. this power cycle has been going on for hours now. i cant get to the lock screen, the farthest ive seen is the white apple when powering up. please help it would be much appreciated!