I have just seen the battery I think you are looking for. It is a 7.2 volt - 800mAH Lithium-ion unit made by CTA that is equal to the Panasonic CGA-S002A1B. http://www.overstock.com/cgi-bin/d2....PROD_ID=716928
Price is $30.99 plus $2.95 shipping. (1 year warranty) I have not used one and can not comment on quality or charge life but
maybe someone else on the forum that has used one can.