The analogy I always use is the filling a water bottle one. In the beginning when the bottle is empty you can go full power and fill it up with high pressure. At the end you need to reduce the pressure to not spill the water. I know it doesn’t work like this with batterie cells but close enough. I had the same aha moment when realizing this. It’s one of the things no one normally thinks about in a world where everything is a given.