diff --git a/Chapter_09/9-09_battery_upgrade.py b/Chapter_09/9-09_battery_upgrade.py
new file mode 100644
index 0000000..b52ad22
--- /dev/null
+++ b/Chapter_09/9-09_battery_upgrade.py
@@ -0,0 +1,77 @@
+class Car:
+    """A simple attempt to represent a car."""
+
+    def __init__(self, make, model, year):
+        """Initialize attributes to describe a car."""
+        self.make = make
+        self.model = model
+        self.year = year
+        self.odometer_reading = 0
+
+    def get_descriptive_name(self):
+        """Return a neatly formatted descriptive name."""
+        long_name = f"{self.year} {self.make} {self.model}"
+        return long_name.title()
+
+    def read_odometer(self):
+        """Print a statement showing the car's mileage."""
+        print(f"This car has {self.odometer_reading} miles on it.")
+
+    def update_odometer(self, mileage):
+        """Set the odometer reading to the given value."""
+        if mileage >= self.odometer_reading:
+            self.odometer_reading = mileage
+        else:
+            print("You can't roll back an odometer!")
+
+    def increment_odometer(self, miles):
+        """Add the given amount to the odometer reading."""
+        self.odometer_reading += miles
+
+class Battery:
+    """A simple attempt to model a battery for an electric car."""
+
+    def __init__(self, battery_size=40):
+        """Initialize the battery's attributes."""
+        self.battery_size = battery_size
+
+    def describe_battery(self):
+        """Print a statement describing the battery size."""
+        print(f"This car has a {self.battery_size}-kWh battery.")
+
+    def get_range(self):
+        """Print a statement about the range this battery provides."""
+        if self.battery_size == 40:
+            range = 150
+        elif self.battery_size == 65:
+            range = 225
+
+        print(f"This car can go about {range} miles on a full charge.")
+    
+    def upgrade_battery(self):
+        if self.battery_size != 65:
+            self.battery_size = 65
+        elif self.battery_size >= 65:
+            print(f"Battery size is {self.battery_size}, cannot upgrade further.")
+
+
+class ElectricCar(Car):
+    """Represent aspects of a car, specific to electric vehicles."""
+    def __init__(self, make, model, year):
+        """Initialize attributes of the parent class."""
+        super().__init__(make, model, year)
+        self.battery = Battery()
+    
+
+    def fill_gas_tank(self):
+        """Electric cars don't have gas tanks."""
+        print("This car doesn't have a gas tank!")
+
+
+Elee = ElectricCar("Tesla", "Model Yass", "2025")
+
+Elee.battery.describe_battery()
+Elee.battery.get_range()
+Elee.battery.upgrade_battery()
+Elee.battery.describe_battery()
+Elee.battery.get_range()
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