> LiFePO4 is one of the easiest types of batteries to charge. As long as > you're not nearing the upper voltage limit, you can float it at ~3.5V > indefinitely. You may be correct, and that voltage is consistent with some other information that I have, but I'd be interested on any technical information you have about what voltage LiFePO4 can be floated at long term. Where did you get that figure from?. 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 .