The truth is without privileged information that we don't have available to us, there is no definitive way of being sure if you have authentic or fakes.
All you can do is buy from an reputable dealer in the first place. If you feel like you may have been duped, dispose of the batteries safely as they are not actually worth that much.
All you can do is buy from an reputable dealer in the first place. If you feel like you may have been duped, dispose of the batteries safely as they are not actually worth that much.