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I've had this happen twice. What is happening is the battery sellers are hawking batteries for the International version of the Galaxy S, the i9000. The i9000 batteries are not completely compatible with the i500 (which is what the Fascinate and Mesmerize are).
If the seller actually stated that it was a compatible battery for the Mesmerize, you should be able to get your money back, because they are mistaken. They can simply do a Google search and find plenty of proof that the i9000 battery is not for the i500.