> The charger I use on my "mobility" scooter has a temp sensor which > clamps on to a battery terminal > > http://www.navstore.com/detail.aspx?ID=1712 Hmmm, interesting. That would be registering heat conducted from inside the battery. As it covers so many types of lead battery presumably there's some smarts in it -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist