I posted the the item regarding the running down of a battery using the Setup page because I know a number of members in the little computer group that I run that have bought laptops instead of a desktop system purely to save space or just so that they can be packed out of the way when not in use. This is fine but most of these members use the laptop as a desktop in so far as they switch on in the morning and it is running all day. I have had numerous problems with the machines suddenly shutting down without warning and invariably this has turned out to be an overheating problem.
I now advise laptop users in this category to every now and again use a compressed air can through the side ports to blow out as much dust as possible, to run with the battery out all the time and just charge it up about once a month. To tand the laptop up on a wire cake stand (The open mesh sort) This gives a good airflow under the machine and helps to keep it cool. This seems to work OK as I haven't had nearly so many calls due to overheating.
N.B. Remove cakes from stand prior to using for the laptop