In June 2004 I purchase 2 Walmart yellow EverStart Maxx-1N batteries=1000 cranking amps @32*f. 950cca, not sure about reserve(?) for $68.67, I had then check in Dec. 2008. Glad to say they check 100% OK. Remenber to rotate the batteries front to back, every other oil change 2500-3000 miles or once a year. I installed a 24v. Solargizer so I guess that has contributed so far to good longevity.