Why is my galaxy 4 battery draining so fast after upgrade to lollipop?

After upgrading to Lollipop, your Galaxy 4 may experience rapid battery drain due to several factors, such as increased background processes, new features that require more resources, or compatibility issues with apps that haven't been optimized for the new operating system. Additionally, Lollipop introduced enhanced animations and visual effects, which can also contribute to higher battery consumption. To mitigate this, try disabling unused features, reducing screen brightness, and updating your apps to their latest versions.