http://www.freescale.com/files/32bit/doc/app_note/AN4428.pdf Interesting looking app note on the principles of balancing cells in a batt= ery pack. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .