Tim wrote: > Standard advice for rechargeable batteries is to use them, you get your > money's worth that way. If you don't make use of them, it's a waste. I'm not sure what this means. Surely most people will use a laptop (or indeed any device with a rechargeable battery) if they have one? What else would you do with it? What I find amazing about this endless discussion is that it must be the simplest thing in the world for a lab to work out which usage gives the longest life. On the other hand, it is difficult for a person with one or even a few laptops to run an experiment on these lines. -- Timothy Murphy e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland