(DE19725204-C1)       The arrangement has a measurement device for the pole voltage (U1 ) and a device for computing the internal impedance (Ri) of the battery. A further device determines the state of charge of the battery from the measured parameters.     A microprocessor-controlled computer unit (C), which is connected in parallel with the pole voltage, controls the charging and discharging of a capacitor (C) and measures and the voltage (UC ) across the capacitor. The computer unit records the times when a first and second threshold voltage is reached, in modes without and with a resistance (R3) connected to the computer. The internal impedance is derived from the difference between the times at which the two thresholds are reached.    USE -   For monitoring the state of charge of a battery, especially a lithium battery for motor vehicle key transmitters or remote controllers.    ADVANTAGE -   Enables reliable indication of available cell capacity. Temperature dependence of the measurement result is substantially eliminated.    (US6191590-B1)       The arrangement has a measurement device for the pole voltage (U1 ) and a device for computing the internal impedance (Ri) of the battery. A further device determines the state of charge of the battery from the measured parameters.     A microprocessor-controlled computer unit (C), which is connected in parallel with the pole voltage, controls the charging and discharging of a capacitor (C) and measures and the voltage (UC ) across the capacitor. The computer unit records the times when a first and second threshold voltage is reached, in modes without and with a resistance (R3) connected to the computer. The internal impedance is derived from the difference between the times at which the two thresholds are reached.    USE -   For monitoring the state of charge of a battery, especially a lithium battery for motor vehicle key transmitters or remote controllers.    ADVANTAGE -   Enables reliable indication of available cell capacity. Temperature dependence of the measurement result is substantially eliminated.