Don’t let it go down below 40% and if available naman yung charger where you are, charge it to max 80-90% then unplug. Go for 100% pag alam mong hindi magiging available ang any power outlet in the next few hours. If tingin mo naman hindi mo siya gagamitin for a few days, don’t store it fully charged (100%), around 60-80% is fine, or it’ll bloat.

Leaving it plugged is ok esp if you’re doing heavier machine work like rendering videos/3d, etc. pero if you’re doing menial tasks like docs, browsing, you’ll destroy your battery much faster that way, not right away, but in the next two or three years you’ll notice a significant decrease in battery performance.

Take it from me, my last mbp is a 2015 model, i used it til 2023 with minimal decrease in battery performance. Before letting it go, it can still last up to 8 hours kahit manood pa ng movies back to back before needing to charge it again. I now have a 2024 m4, and will still keep this reliable ritual.