I have noticed that battery life with /e/ on my FP4 is much worse than with stock Fairphone OS or with LineageOS. When I leave phone without charging. When I fail to charge the phone for the night, in the morning, the battery percentages may have dripped up to 40% when I have used / e / operating system. When I have installed stock Fairphone OS for FP4 or LineageOS I don’t have that problem.
You might cross check with this forum search Search results for '#fp4 + battery life order:latest' - /e/OS community where similar issues are reported.
I have no comparison to other OS but my FP4 lasts approx 3 days until down at 20% with some light browsing, sms and few calls.
Maybe take a look at the akku consumption in settings to nail down some culprit apps.
HtH
Should be fixed in /e/OS 2.10
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