I really don’t get the point behind micromanaging and willingly using half of the battery capacity.
So let’s say that we charge up to 80% and use it until 20%. You are using 60% of the capacity with a brand new phone.
1. The battery is still aging
2. You are already using only 60% of the battery, that is equivalent to a 5-6 year old phone
3. Since the battery ages anyway, the “60%” that you are using is going to be less actual use time every month/year
I can write much more, but there’s no point. Batteries are consumable parts and cost 100 to replace every 2-3 years if you want peak performance.
And if you are fine with 60% of the original capacity to begin with, why bother? The battery will reach that point after 5-6 years anyway, but at least you enjoyed 100-90-80% for quite a few years.