Battery iPhone 4s doesn't charge at all

Hi recently I open my iPhone 4S and now my battery doesn't charge instead of showing the lightning bolt icon indicating it was charging, it showed a plug icon. However, as indicated, the battery was continuing to run down so I tried all 3 cords, different outlets, etc. with the same result--the phone only showed a "plug" icon inside of the battery icon and the battery continued to lose charge. I tried turning the phone completely on and off but that only produced the same result. The battery inevitably lost all charge and my phone is now dead. Any suggestions?