I got my 2013 FX used, so, can't speak to any initial charging when new. From day one, it would charge to 95%, showing 5.0x kW.
I noticed by accident that if I unplugged it, then, plugged it back in, it would go to 97% 5.122 kw ( or, something like that ). If I
unplugged it a second time, then plugged it back in, it would charge to 100% 5.336 kw. Not sure if it ever went higher than that,
but, that is the highest it has ever been since I have owned it. I also have the external charger. If I plug in both chargers, it charges
to 100% first time. The next morning, when I come out, no matter how high the finished charge was, it was at 95%. Lately,
( two years and 10K miles later ) is is only showing between 87% and 91% after settling down. Again, no matter how high the
charge was at completion. I discovered that if I took bike off of charger at 100%, then, rode, it dropped to 95% after almost
no distance, so, figured that it just took off the "surface charge" and put me back to where it would have been the next day.