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Lower screen brightness manually or enable auto-brightness in Settings > Display & Brightness for significant battery savings.
Activate in Settings > Battery when low. Disables background activities like mail fetch and visual effects.
Limit apps refreshing in Settings > General > Background App Refresh to save battery.
Manage in Settings > Privacy > Location Services. Disable or set to "While Using the App" for select apps.
Switch to manual or scheduled fetch in Settings > Mail > Accounts > Fetch New Data to conserve battery.
Check battery usage in Settings > Battery. Consider uninstalling or limiting usage of high-drain apps.
Keep iPhone and apps up to date in Settings > General > Software Update for improved battery efficiency.