14 hours is amazing for the S20 +. I have the Ultra with all the settings turned to low usage, also only using 60hz display and I lose 22% battery every hour. It really is a peice of rubbish in terms of battery life. My S10+ was soooo much better for battery life.
The Exynos 990 is the reason for the awful battery in the S20 range, the Qualcom 865 version is fine. This is why Samsung built the S20 FE in my opinion