Casio Pda Battery I Need Your Advise Please...!?

I need your advise please...!? - casio pda battery

Vi Casio PVS-1600 points on E. Bay ...
I wonder, some of them are not so cheap? Will they be used?
If I buy one, it's working well?
http://search-desc.ebay.in/pda_casio_w0q ...



: Http: / / / computers.listings.ebay.in Handb ...
Thanx ...