Abstract: A method for estimating the state of health of an exchangeable rechargeable battery. The method includes: i. determining a remaining capacity of the battery during a charging operation, in such a manner, that a first charging value is ascertained by measuring an open-circuit voltage, as long as no charging current or only a minimal charging current is flowing; at least one further charging value is ascertained by measuring the charging current in specific time intervals, until the charging operation is completed; and a sum of the ascertained charging values is calculated; ii. determining a remaining performance of the battery during the charging operation in such a manner, that after a predefined battery voltage is reached, the charging current is briefly changed, and the respective battery voltage is measured; and an impedance of the battery is calculated from the quotient of the difference of the measured charging currents and battery voltages.

Abstract: The disclosure relates to a method for interacting with a user of a rechargeable-battery-operated machining tool, which can be supplied with energy by means of an exchangeable rechargeable battery pack or exchangeable rechargeable battery. According to the disclosure, in one method step a power characteristic variable of the exchangeable rechargeable battery pack or exchangeable rechargeable battery is sensed by means of a sensing unit of the rechargeable-battery-operated machining tool and/or of the exchangeable rechargeable battery pack or exchangeable rechargeable battery at defined times during the operation of the rechargeable-battery-operated machining tool, and in an additional method step the frequency with which the exchangeable rechargeable battery pack or exchangeable rechargeable battery has been operated at its power limit is calculated.

Abstract: A method for estimating the state of health of an exchangeable rechargeable battery. The method includes: i. determining a remaining capacity of the battery during a charging operation, in such a manner, that a first charging value is ascertained by measuring an open-circuit voltage, as long as no charging current or only a minimal charging current is flowing; at least one further charging value is ascertained by measuring the charging current in specific time intervals, until the charging operation is completed; and a sum of the ascertained charging values is calculated; ii. determining a remaining performance of the battery during the charging operation in such a manner, that after a predefined battery voltage is reached, the charging current is briefly changed, and the respective battery voltage is measured; and an impedance of the battery is calculated from the quotient of the difference of the measured charging currents and battery voltages.