There was a recommendation on this board not too long ago for the Exide Select Orbital 12v battery as a replacement for the OEM 12v battery. See http://www.exide.com/products/automotiv ... l_XCD.html . I can't answer your question about compatibility---maybe some of the technical-minded contributors to this site could address that issue. I gotta say, though, that what the dealer told you sounds a little fishy to me. There's a lot of misinformation out there about hybrids in general and Prius in particular, and dealers are not immune to this problem.