the battery pack is after a long test the original battery to 100 percent. More I must not say, because everyone will probably know what quality of the original battery has ... Accordingly, NFC is included.
IMPORTANT!
I have ordered from Amazon and get the battery in the original Samsung packaging versigelten. Since I wanted to buy a battery for the S2 to me then I know a lot of plagiarism are on the road, which are sold as original battery. So I would advise you 4 EUR to spend more and to order from Amazon. If not the battery arrives in the original Samsung packaging but only in a sachet, return directly and report the dealer at Amazon!