Has anyone used these? They are rated for 2200 mah, come in a 2 pack with charger. Price is very reasonable on Amazon.
They also have the NFC antenna in them.
I actually bought this very package, and loved the fact that I never had to plug in my phone for over 10 months! I just kept a cycle going between the three batteries ( the 2 Ankers and the stock battery, all which can be charged in the charger they provide) I've since moved on to an LG G Flex, and I do miss the swappable batteries :/ The one complaint I have is really just a minor gripe, but it takes about 6-7 hours to completely charge a battery with their charger.. Other than that, the day to day use was excellent, exceeded the stock battery in day to day use!