Following up from my post earlier this month, Polycom's SoundStation 2W batteries are being recalled.
You can remove the battery and continue using the conference phone with the AC adapter.
For details on how to do this, and for other information on the recall, here's the URL:
http://www.polycom.com/resource_center/1,,pw-13752,FF.html
Here's the link to the FAQ:
http://www.polycom.com/resource_center/0,,pw-13753,FF.html?trackID=13753
Here's the link to the US Consumer Safety Protection Commission's document (PDF):
http://eknowledge.polycom.com/media/SoundStation2W/polycom%20phone%20battery2-14-06.pdf
