BatteryLevel https://darylrobotproject.wordpress.com/

public class BatteryLevel {

    /**
     * @param args
     */
    public static void main(String[] args) {

        Kernel32.SYSTEM_POWER_STATUS batteryStatus = new Kernel32.SYSTEM_POWER_STATUS();
        Kernel32.INSTANCE.GetSystemPowerStatus(batteryStatus);
        System.out.println(batteryStatus);


    }

}