Dell Latitutde e6410 battery doesn't charge

So that 'future' me (or 'right now' you) do not have reverse-engineer the Manhattan Project to fix this.

1) Pull the battery out and put it back in, and double check that Windows recognizes it (with zero charge, 'not charging,' but on AC power).

2) Hold the little blue FN button down and then press F2. 

3) Or hold it down and press F3, then repeat step 2).

4) Or restart the computer and return to step 1).

That is all.