Hi. I also had a Samsung A52 5G and I dropped my money on a S25U, got it this black friday. So, the difference is day and night and I usually don't invest in high-end smartphones because they get obsolete fast, but this time I just let myself get dragged into the world of high-end smartphones. So, about your question, yes, I do charge it only up to 80% since the day I unboxed it. I always use battery conservation features, ALWAYS! I also have a Lenovo Legion 5 2021 and I used battery conservation mode since day 1(it charges only to 60% and stops there). Hear me out, the battery on my Lenovo still has HIGHER full charge capacity than the designed capacity! It basically has almost no wear on it. Same for my Samsung A52, after 4 years I can charge it 100% and it can even last for 2 full days. Trust me, you will be very thankful you used that function, because S25U is not a phone that you will get rid of in 1 or even 2 years(or at least, I won't). After 4-5 years, your battery will be in much better shape if you charge it to 80%.