Those of you clever guys running things at very low power may like to peruse the newest issue of the Maxim Engineering Journal. There is an article in it called "Lithium coin-cell batteries: predicting an application lifetime", refers mostly to using Dallas devices that incorporate these cells, but has handy looking graphs as well. I get a paper copy of this journal, but I believe it is also available on the Maxim web site. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics