So... I'll probably just stick with parallel Li ions for simplicity. Then there's the problem of them charging each other. What do you guys think about this? http://www.linear.com/product/LTC4411 I'm thinking of putting a few of those in parallel (one for each Li ion battery). Good idea? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .