Shane,
Here's what Apple says about this switch:
===============================================
SECTION I: General Duo Questions and Issues
(http://til.info.apple.com/techinfo.nsf/artnum/n14189)
1) Question: What does the switch on the battery do?
Answer: The switch is simply a way to help remind you if the battery is
charged or not.
================================================
Igor (still struggling to fix the battery problem)
> Turns out
> that on some of the new batteries there is a switch on
> the side. So after two days of taking the 2300 apart,
> I found the switch and turned it on. Everything works
> now.
----------
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