HEY!!!!!
Throw this batery in the trash and buy a new one!
I had same problem!I left it the whole night to charge, and tomorrow i wanted to use the camera,but i got a popup that says "Another application is running,close it and then start the camera".I was realy angry and reflashed my phone 39 times!I opened the front housing and removed the display,and i could not believe what i see!The ribbon flex cable was no more!Theres like a mini-explosion hapened in my phone!The batery was over charged and fried the flex cable!

Buy a new phone or battery,i just re-insert the battery and it says "Optimized charging"