Battery Power for Arduino Pro Mini - 3v3 or 5v?

Forum 2005-2010 (read only) General Frequently-Asked Questions
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After some more digging, I also found this great thread:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1223295094/all

I've gone an ordered the Arduino Pro mini 3v3 version. So when it gets in I'll post with powering results.