This might be helpful http://www.golfgps1.com/Garmin-Approach-G6-vs-G5.html
I'm not sure about the the built-in rechargeable battery. I like carrying extras AA rather than forgetting to recharge and you're done!
FYI for anyone interested in being a Cleveland Golf/Srixon tester. Nifty concept by a great Company.
http://www.cglaunchsquad.com/
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