Consider Replacing Your Battery Error

Hi experts,
I have been using a laptop from 3 years & it's performance is very good. But got a problem from two months. Computer shows me a message, "consider replacing your battery". My laptop battery also gives battery back up, but always shows this message. A red cross icon always show on the battery icon.
I have been trying to solve this problem but failed. I want to know any solution to this. Please give me a solution for this problem as soon as possible.
Regards,
johnsohel.
