Since installing Google Wallet yesterday, I still haven't had a chance to test it. PayPass app told me our local Kroger had the capability to do this, but sadly they didn't. Anyway, in an effort to learn more about how NFC and Google Wallet works together, I just finished reading a few different articles. One thing I noticed mention of was that since the antenna for NFC resides in the battery, this requires it to re-authenticate with a token on the NFC chip, and the article stated that it may cause a "less than optimal" experience for those who may switch between the standard and extended batteries, even while using the OEM batteries. Has anyone had any experience with swapping batteries around and using NFC? If so, what were your results?