I don’t think many people with a FP4 will be switching to 5 so not many people can answer your question.

I can only say the FP4 battery lasts me long enough to get me through the day. And would only drain before the evening after intensive use. On fridays i’m awake longer than on weekdays and also need my phone for a hobby and while typing this near midnight, the battery sits at 17% after being fully charged last night.

I don’t use my phone very much at all, just checking a few things every now and then during the day, and I usually get 2-3 days from a single charge. I’ve had it for almost two years now, and still getting 2-3 days of charge on the two year old battery.

Battery life really depends on how much you’re using it. If you’re playing Genshin Impact or something then you’ll wear it out in a matter of hours of course. I have no idea about the FP5.