The oem extended battery you bought also has the NFC chip like the standard oem battery. Your fine.
yep....extended battery works great with wallet. I just bought some clothes at the mall and then hit up a convenience store for some smokes, a coke, and some beef jerkey.......I havent seen my wallet since saturday night.....just me and my gnex spending money like a pimp.....a jaded, middle aged, paunch bellied, extremely white pimp.