Method, for estimation of State-of-health characteristics of a battery in hybrid vehicles, comprising the steps of: - charging and discharging the battery at least one time within an upper region of a State-of-charge window, wherein the battery: i) is charged to a first predetermined level in the upper region of the SOC window during a first time period; ii) is charged by a first charge current impulse for pushing the SOC level of the battery to a level above the first predetermined level and outside the SOC window, during a second time period; iii) is discharged by an electrical machine to a second predetermined level within the SOC window; - charging and discharging the battery at least one time within a lower region of the SOC window wherein the battery: i) is charged to a third predetermined level in the SOC window, during a third time period; ii) is discharged by an electrical machine to a fourth predetermined level in the SOC window; iii) is discharged by a second current impulse, for pushing the SOC level of the battery to a level below the fourth predetermined level and below the SOC window, during a fourth time period; - calibrating a battery management unit comprised in the hybrid vehicle by using the reached levels outside the SOC window for determining correct upper and lower edges of the current SOC window; - estimating the SOH characteristics of the battery during the charge and discharge periods by using the battery management unit for determining the condition of the battery in comparison to a new and unused battery by comparing the current SOC window with a standard SOC window, wherein; the first and third time period is longer than the second and fourth time period respectively; and the first predetermined level represents a higher voltage, than the second predetermined level and the third predetermined level represents a higher voltage, than the fourth predetermined level. - charging and discharging the battery at least one time within an upper region of a State-of-charge window, wherein the battery: i) is charged to a first predetermined level in the upper region of the SOC window during a first time period; ii) is charged by a first charge current impulse for pushing the SOC level of the battery to a level above the first predetermined level and outside the SOC window, during a second time period; iii) is discharged by an electrical machine to a second predetermined level within the SOC window; i) is charged to a first predetermined level in the upper region of the SOC window during a first time period; ii) is charged by a first charge current impulse for pushing the SOC level of the battery to a level above the first predetermined level and outside the SOC window, during a second time period; iii) is discharged by an electrical machine to a second predetermined level within the SOC window; - charging and discharging the battery at least one time within a lower region of the SOC window wherein the battery: i) is charged to a third predetermined level in the SOC window, during a third time period; ii) is discharged by an electrical machine to a fourth predetermined level in the SOC window; iii) is discharged by a second current impulse, for pushing the SOC level of the battery to a level below the fourth predetermined level and below the SOC window, during a fourth time period; i) is charged to a third predetermined level in the SOC window, during a third time period; ii) is discharged by an electrical machine to a fourth predetermined level in the SOC window; iii) is discharged by a second current impulse, for pushing the SOC level of the battery to a level below the fourth predetermined level and below the SOC window, during a fourth time period; - calibrating a battery management unit comprised in the hybrid vehicle by using the reached levels outside the SOC window for determining correct upper and lower edges of the current SOC window; - estimating the SOH characteristics of the battery during the charge and discharge periods by using the battery management unit for determining the condition of the battery in comparison to a new and unused battery by comparing the current SOC window with a standard SOC window,