....Lead acid... may have a similar region... Lead-Acid lore claims that a battery maintained at less than full-chg for any great length of time will lose the unused capacity to sulfation. I'd be interested to know if this is so. Jack --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .