V G wrote: > 1. What is energy density anyway? Is it energy/mass or energy/volume? Depends on what you care about. Both are valid metrics in different situations. For example, if you're doing a airplane, energy/mass is most relevant. If you're doing a small handheld appliance, energy/volume is probably more important. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .