Duncan.F, I am having a similar problem with Dell laptop, running Vista. 'Battery plugged in, not charging.' Yet over the past 2 weeks on about 3 occasions it has re-charged fully.I use an independent computer technician, and he thinks that it is a design fault, and that a group in the USA is looking at a lawsuit against the manufacturers. I use mine on the mains the whole time, and there are different opinions as to whether the battery should be in the machine the whole, and end up being 'cooked'.