The invention relates to a method, for estimation of state-of-health (SOH) 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 (SOC) window, wherein the battery; charging and discharging the battery at least one time within a lower region of the SOC window wherein the battery; calibrating a battery management unit comprised in the hybrid vehicle by using the reached levels outside the SOC window; and estimating the SOH characteristics of the battery during the charge and discharge periods by using the battery management unit.