Keep your iPhone software up to date: Keeping your iPhone's software up to date ensures that you have the latest battery-saving technologies.
Use Low Power Mode: Low Power Mode reduces the amount of power your iPhone uses when the battery gets low.
Avoid extreme temperatures: Extreme temperatures can affect the performance and lifespan of your iPhone's battery. Avoid leaving your phone in a hot car or in direct sunlight for extended periods of time.
Charge your iPhone properly: Avoid overcharging your iPhone by unplugging it when it reaches 100%. It's also a good idea to let your battery drain to 0% once a month and then fully charge it back up to recalibrate the battery's gauge.
Use auto-lock: Setting your iPhone to auto-lock after a short period of inactivity can help conserve battery life.
Turn off push email: Push email constantly checks for new email, which can drain your battery. Consider turning off push email and instead manually checking for new emails.
Use Wi-Fi when possible: Using Wi-Fi instead of cellular data can help conserve battery life.