I have installed the iOS 14 on my iPhone 6s plus and the battery drains pretty fast. After analysis I got root cause and solution for battery drain issue.
Root cause of battery drain and temperature high issue due to wifi and bluetooth bug.
Solution:
Below steps need to perform to fix ios 14 battery drain issue on iphone.
1) Reset network settings.
Settings-->General-->Reset-->Reset Network Settings
2) WIFI off
Settiings--> WI-FI--> off
3) Bluetooth off
Settings--> Bluetooth--> off
After performing these steps my battery drain and temperature high issue have been resolved. Battery performance back to normal. Please do from ur end hopefully issue will be fix.
cnubathula
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Mumbai, Maharashtra, India