int GetBatteryLevel()  
    {  
        try  
        {  
            string CapacityString = System.IO.File.ReadAllText("/sys/class/power_supply/battery/capacity");  
            return int.Parse(CapacityString);  
        }  
        catch (Exception e)  
        {  
            Debug.Log("Failed to read battery power; " + e.Message);  
        }  
        return -1;  
    }  
}