How do I know if my battery is legitimate OEM and new? (Galaxy Note 4)

[AC Question]

I had some issues with my original battery, so I bought a new one at t-mobile store.

I paid $30 for it when I can simply buy one for less than $15 online, because I wanted a legitimate real OEM battery.

There wasn't any package. The store guy told me that they are buying batteries in bulk, so there is no package. (Not even plastic bag or anything, I literally got just the battery)

Can I trust this guy, because it's a t-mobile store?

It does look the same as the original battery that I've been using though.

By comparing the two, everything is exactly the same except that original is made in China and this one is made in Vietnam.

 

[Rukbat]

There's no "official" battery - they get them from multiple sources. China makes most lithium batteries. Now Viet Nam is getting in on the act?

 

[paulrf072894]

One way is feel it and see if you can feel the NFC antenna. If so it is most likely an official battery.

I've attached a pic of the battery I recently purchased.

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