New Battery stops charging at 45%

Hi, I hope somebody can help me. I have just purchased a new battery for my Fujitsu Amilo pi 3660 notebook. I have tried so many times to charge it. I have fuilly discharged it and recharged it. I have installed and reinstalled drivers. No matter what I do, it stops charging at exactly 45%. I know the battery is sound and the problem is a software issue. Does anyone know how to change...