iPhone 11 battery... serious drain after ios 14.6. Help!

Protect & Prolong the life of your iPhone's Battery: Batteries - Maximising Performance - Apple (IN)

Try some of these options too.

1. Avoid Screen Mirroring
2. Put on Low Power Mode
3. Put Auto-Lock on (1 min):- with low power mode it will be 30 Sec
4. Put Auto Answer Off
5. Disable Push notifications for apps you do not use often
6. Keep your iPhone Facedown to prevent notifications to light up the screen
7. Enable Auto-Brightness:- Settings > General > Accessibility > Display Accommodations > Auto-Brightness [Enable]
8. Manually lower brightness from Control Center
9. If you Want to watch continuous Video. Stream it on TV or a Monitor
10. Don't force close apps; Apps that are not on the frontend screen are paused by the system to save energy. Apps require more energy to re-launch. Apps that are open in the background use large memory is a myth and quitting them is counterproductive
11. Location services to be allowed only while using the app
12. Set your iPhone to fetch email and calendar data from the internet less frequently
13. Turning off Background App Refresh 
14. Charge before it drops below 20-30%
15. Try connecting to trusted Wifi wherever available instead of Cellular
16. Enable Airplane mode in areas with bad cellular and wifi coverage. Your phone keeps trying for reconnection with the missing/weak network. This uses a lot of energy
17. Switch off Wifi & Bluetooth while in Roaming or Not in Range
18. Enable "Wifi Assist" : Settings > Cellular or Settings > Mobile Data > Wi-Fi Assist [Enable]
19. Periodically Check the Battery Health (Settings > Battery > Battery Health)

Hi there,

I am not quite sure whether you are referring to an iPhone 11 Pro or an iPhone 11, these two devices, while named similar, do not use the same display technologies which alter the amount of time that the phone lasts.

If you are referring to the iPhone 11 (not Pro), 6 hours is already very good. My personal iPhone 11 with battery health at 88% lasts less than that on a typical day.

If you are referring to the iPhone 11 Pro, which uses an OLED screen, different use cases can alter the battery life significantly. However, considering the massive battery upgrades for the iPhone 11 Pro, 6 hours seems a bit odd.

One solution to the problem you raised is by restoring your device. You should first backup all your data on your phone (photos, contacts, app data etc.) to either a computer or to iCloud. Make sure that you have all the data you need backed up completely as Apple cannot help you restore the data once the device is reset. After you confirm that all the data required is backed up, factory reset the device. Afterwards, download the backup you have created earlier. This should iron out the issues if there were bugs caused by cache or daily usage.

Apple’s official links for restoring from Mac or iCloud:

https://support.apple.com/en-us/HT201252

https://support.apple.com/guide/icloud/restore-or-set-up-your-ios-or-ipados-device-mm7e756df7fd/icloud

Hope it helps!

iPhone 11 and later models, battery performance --> About the battery and performance of iPhone 11 and later