That goes against what I've been told by battery experts at my company and what I've read when researching on my own. The only reason I've been given to do a full drain is to reset the accuracy of the battery meter over time. The point that running the battery through a few cycles when new will bring it up to full performance is correct, but there is no need, from what I've been told, to run the battery all the way down. Of course, running it all the way down a couple times probably won't hurt. Reminds me maybe of speaker companies that tell customers customers that speakers need to be "broken in" and will sound better over time. Speakers don't break in, but they realized that if you keep the speakers for a while you'll get used to the sound and be unlikely to return them.