I'm far from being an expert on batteries. All I know is what a Google search allows me to know. But one thing I've read over and over again is that Lithium-Ion batteries do not have a memory. You are thinking of Ni-Cad batteries. Here is but one example of an article that turns up on the many pages that appear when you Google "Lithium battery charging" or something similar. In particular read tip #3.
http://www.techrepublic.com/blog/fiv...-battery-life/