On a related note, I know that when you're charing your battery, you should wait until it's just about dead, otherwise you could hurt the performance of the battery.
Now, somebody told me that this does not matter for newer phones, because they use a different battery. So now you can charge it pretty much anytime without worrying about damaging the battery. Is this true, and does it relate to the W580, which just came out a couple of months ago, I believe.