I would not recommend an aftermarket battery for the Pro. The NFC antenna is built into the battery and it seems like the underlying OS has a "smart" driver for the battery.
If samsung sells a bigger battery that has the Pro listed as a compatible device I would expect it to work but I make no promises.
Also: patience. The Rugby Pro has a smaller online following and the few of us lurking about on the forums tend to get daily or weekly digests for new posts.
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