The problem is, no one sets out to buy a counterfeit battery. If you're buying a 3rd party battery, then that's your choice (though many manufacturers aren't big fans of that, either). But if you end up with a fake Nikon battery, it's because you're attempting to buy a real one, and end up with a forgery. And the only way to tell is to compare it to the real deal. According to Canon, 18% of consumers unwittingly bought forgeries last year.