What are your experiences designing and testing battery packs for UL approval, including charger, protection, etc? I am under the assumption that li-ion and li-poly batteries have more strict standards due to volatility when over charged and discharged - is this true, or is it just as difficult to design and pass NiMH and NiCd packs? -Adam --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .