My current phone is also an S20 FE (SD865). Comparing it to my previous phone, a Oneplus 6 (SD845), both get almost identical amounts of screen-on time while browsing the web at 150 nits, despite the S20 FE having a 4500mAh battery and the OP6 a 3300mAh battery. The SD835/845 era was a high water mark for performance per watt and so far the situation is only getting worse. The 888 and 8 gen 1 are both hot power hogs and the exynos 2200 is a garbage fire.