The battery I received is a Sanyo lithium battery, made in China, with a label that specified it is a replacement for the orginal Palm Treo battery, which wears out eventually. (That's why it's replacable -- Steve Jobs please take note!) The battery holds a charge well, fully the equal of the original one that came in the Treo.Sometimes you see ugly reviews about aftermarket batteries that blow up or don't hold a charge or cause high fevers and chills, but I've never had bad experience -- not with this one or with two aftermarket batteries for my Canon digital camera. Perhaps some of those stories are plants by the manufacturers who want you pay a lot more for their "authorized" replacements. In any case, this replacement for a Treo battery does exactly what's supposed to do.