This is how it went down - My iPhone 3GS (no warranty, jailbroken, unlocked) battery had just gotten in the red zone - 9% so i put it on charge on a laptop. As soon as i put it to charge, the battery jumped to 13% and continued to charge. I had to sleep and shuffle stuff around.. was lazy so i just removed the cell from charge and kept it aside at 19% or so batt level. Next morning when I woke up the phone was dead. It wouldn't start on wall plug nor laptop, iTunes wouldn't detect it. Its been a week now, with endless hours of being plugged to laptop/wall charger. Still nada signs of vitals. My guess is, the battery cutt off circuit got uncalibrated when the battery lever rose by a few points as i had mentioned.. giving the phone access to emergency charge reserved for revival on next charge.. hence the lifelessness.. Have since tried pressing both power and home together to revive, tried the mute trick and various combinations, tried restarting computer with iPhone on usb, tried putting usb in laptop whie pressing menu n et all.. Absolutely nothing has produced any results so far. Anyone got a clue?