Hi Luis - This may be of interest - Something of a worst-case application for deep-cycle batteries, and it's mitigation, written by the worst- case in person... An engineer, too. :) http://www.wheelchairdriver.com/my-batteries.htm --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .