The power plugs are really buggy... its nice that they are there, but the designers did a really poor job on them. They work with some laptops but not all depending on how much power they draw... I can only get it to work sometimes with mine, doesn't matter if the battery is in or out, I get the same result with them. I just gave up and carry extra batteries. I've tried it several times on both the 744 and 732 and get the same lousy results with both.