Started yesterday morning with 4387 (new out of the box), after Apple recommended "conditioning" I now have 4651 of the 4680 total capacity.
Fully charge it to 100%, then leave on the charger for a min 2 hours after hitting 100%.
Then fully discharge until it shuts down, leave unplugged for 5+ hours.
Rinse and repeat. I'm on the 2nd go and it's made a difference for sure. The odd thing for me was Coconut battery meter shows the battery only 1 cycle, but it's 11 weeks old, which explains why the battery was completely dead out of the box to the point it wouldn't even boot up until I plugged in it for about 15 mins.
Point being, run the "calibration" it can change your max capacity.