Lithium batteries are almost free of memory effects, what will degrade the performance of the battery over time are build up of chemicals due to irreversible chemical reactions. If the battery is charged or discharged close to or beyond 100% charge state or close to or below 0% charge state, then you'll get a lot more of the irreversible chemical reactions in the battery. These irreversible chemical reactions are minimized between about 30% and 40% charge state. This means that it is best to store and use the battery near about 40% charge state.

The problem is then that it's not really very practical to only use your battery from 40% till 30% and then top it up to 40% again. You'll have to carry many batteries with you, if you want to do that, and the cost of all these extra batteries needs to be taken into account as well. But in principle, doing only one tenth of a charge-recharce cycle from 40% to 30% and back will lead to much less battery degradation per full charge cycle compared to doing full recharge cycles from 100% to 0% and back.

I use two batteries, I store one at about 35% charge, the other one is ready for use at 50% to 60% charge. When that battery nears 35%, I charge the other one to somewhere between 50% and 60% and I then interchange the batteries. I will only charge one or both batteries to 100% if I plan to take many pictures.