LiFePO4 and LiIon voltages got a bit mixed in that account. The 3.5V float threshold is NOT overly low for LiFePO4 - just down 0.1V from usual Vmax. Whether enough to avoid Li plating is tbd. Russell --=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 .