If your iPhone X is showing 100% battery health, it means that your battery is in optimal condition and should be able to hold its charge as expected. However, there are several factors that can affect the battery life and how long it lasts on a single charge. Here are some tips to help you maximize the battery life on your iPhone X:

1. Adjust screen brightness: Lowering the screen brightness or enabling auto-brightness can help conserve battery power.

2. Enable Low Power Mode: When your battery is running low, you can activate Low Power Mode from the Control Center or the Settings app. This feature reduces background activity and optimizes system performance to extend battery life.

3. Manage background app refresh: Some apps refresh their content in the background, which can consume battery power. You can go to Settings > General > Background App Refresh to manage which apps are allowed to refresh in the background.

4. Disable unnecessary push email: Push email constantly fetches new messages, which can drain battery life. Consider changing your email settings to manually fetch new messages or fetch them less frequently.

5. Reduce location services: Apps that use location services can drain the battery. You can manage which apps have access to your location in Settings > Privacy > Location Services.

6. Disable unnecessary notifications: Unnecessary notifications can wake up your device and consume battery power. Review and disable notifications for apps that are not important to you in Settings > Notifications.

7. Close unused apps: Although iOS manages app background activity efficiently, closing unused apps can help save some battery life.

8. Update iOS and apps: Keeping your iPhone X up to date with the latest iOS version and updating your apps can bring performance improvements and bug fixes that could optimize battery usage.

9. Use Wi-Fi instead of cellular data: When Wi-Fi is available, using it instead of cellular data can help conserve battery power.

10. Avoid extreme temperatures: Extreme temperatures, both hot and cold, can affect battery performance. Avoid exposing your iPhone X to temperature extremes.

Following these tips should help you optimize the battery life on your iPhone X and make it last longer on a single charge.