Spare Battery.... What are your thoughts now...?

I'm looking up spare batteries on Amazon for my new boss after a Christmas lunch where he said his Note 4 battery has started losing capacity since he started using a power pack and is stuck in a vicious circle.

My question is some OEM listings (here in the UK, and on Amazon.com) refer to being NFC capable. Is that still the case, or is it not part of the battery, I forget from my Note 3 days.?
I'm also recommending the Anker battery and the Samsung charging kit. The Anker twin charging pack, like the Note 3 version, is not sold here.
 

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