Hi all, I had bought Sony

Hi all,

I had bought Sony CyberShot DSC-W55 and after making one series of pictures I had to charge a battery. After charging camera hadn't been used for around 1 week. When I was trying to take some pictures again it showed me that battery is dead (which was fully charged). After repeated charging situation remain the same.
Do you know where the problem is?
What should I do?

Thanks in advance.
Pawel