Since the cells are in parallel, they would appear as a single cell lithium ion battery. There are a lot of stand alone charge chips for these. I've used a couple from Linear Technology. Add a resistor and capacitor and you're done. See http://www.linear.com/pc/viewCategory.jsp?navId=H0,C1,C1003,C1037 Harold -- FCC Rules Updated Daily at http://www.hallikainen.com - Advertising opportunities available! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist