a method is provided for determining the reliability of state of health parameter values for a battery including a plurality of battery cells , the method including the steps of receiving , for a state of health parameter , a plurality of measured parameter values for the battery , comparing the measured parameter values with at least one predetermined parameter criterion ; and determining that the measured state of health parameter values are reliable if the state of health parameter values fulfil the at least one predetermined parameter criterion . a corresponding system , computer program , and computer readable medium are also provided .