or you can order a genuine battery from Verizon directly.(corporate-owned store or verizonwireless.com) I ordered it from them and received it within 2 day.
Getting a genuine battery on Amazon is also iffy. I ordered one that was sold and shipped directly from Amazon.com, LLC(not 3rd party seller) and it stilled looked fake.
A genuine battery from Samsung will have a clear plastic case and a genuine Samsung packaging.