downgrade iPhone 6s
I very much ask you to give the opportunity to reflash iPhone 6s to iOS 12. The battery is consumed millions of times faster with newer versions of iOS. Sign the old firmware version for iPhone 6c. You are welcome.
iPhone 6s
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There is no such option, however...
Protect & Prolong life of your iPhone's Battery:
- About the battery usage on your iPhone, iPad, and iPod touch ...
- Batteries - Maximising Performance - Apple (IN)
- iPhone Battery and Performance
Try some of these options too.
- Avoid Screen Mirroring
- Put on Low Power Mode
- Put Auto Lock On (1 min):- with low power mode it will be 30 Sec
- Put Auto Answer Off
- Disable Push notifications for apps you do not use often
- Keep your iPhone Face down to prevent notifications to light up screen
- Enable Auto Brightness:- Settings > General > Accessibility > Display Accommodations > Auto-Brightness [Enable]
- Manually lower brightness from Control Center
- If you Want to watch continuous Video. Stream it on TV or a Monitor
- Don't force close apps; Apps which are not on frontend screen are paused by the system to save energy. Apps require more energy to re-launch. Apps which are open in the background use large memory is a myth and quitting them is counterproductive
- Location services to be allowed only while using the app
- Set your iPhone to fetch email and calendar data from internet less frequently
- Turning off Background App Refresh
- Charge before it drops below 20-30%
- Try connecting to trusted Wifi where ever available in stead of Cellular
- Enable Airplane mode in areas with bad cellular and wifi coverage. Your phone keeps trying for reconnection with the missing / weak network. This uses lot of energy
- Switch off Wifi & Bluetooth while in Roaming or Not in Range
- Enable "Wifi Assist" : Settings > Cellular or Settings > Mobile Data > Wi-Fi Assist [Enable]
- Periodically Check your Battery Health (Settings > Battery > Battery Health)