FWIW, I bought my E300D in 2002...came with an interstate "megatron" 72 month battery...it is still going strong. The newest version of the battery for the E300D is now warranted for 85 months. $115 suggested price from manufacterer.

http://www.interstatebatteries.com/estore/search.asp?details=1&mscssid=7EC1RPWSFN1F8K3MT8AF89L8STE5D951&N=21+4294574607+2147384749+4294574605&part_number=MTP%2D93&part_desc=Mega%2DTron+Plus+%2D+85+Months+%2D+850+CCA&Nu=Part+Number&Ns=product+Type%7C0%7C%7CRank%7C1&js=1