Shouldn't be a problem at all, unlike the old batteries, these ones take very well to top-ups. It is said tho, that these types of batteries perform best between 20-80%
But there's a whole bunch of protection hardwired into them that takes care of things without the need for you to worry about it. I believe it slows charging upwards of 90% and very slowly approaches the relative 100%
The only way you could slightly mess with it was if you'd be fully charging it and then unplugging, plugging back in, turning it on and off all at around 100. That might skew the calibration some, but still not worrisome.