'Charging Alien Battery' in K800i

[crosodude]

Problem started like this.... somedays before 2 keys of my phone stopped working... As the warranty period was over, i gave the phone in a mobile shop near to my house..
When i got the cell back, the keypad was fine... But when i start charging it showed - "Charging Alien Battery"...

I removed the battery and inserted in my friend's mobile who too was having the same model, but it showed 'Optimizing Battery' ... But in my cell it showed - "Charging Alien Battery"...

I gave the phone in the authorized service center of Sony, they told, they are not sure whether this problem can be rectified...

Now the charge gets down too fast, wen the battery level reaches 32%.... the battery bar shows an empty symbol(full white color)...

Please help me ...... :(