since i work at costco, i got the #'s on our optimas.
910 cranking amps
720 cold cranking amps
90 rc (i dunno what that is..anyone??)
group/size is 75/35.
$99.99
here's the good part. i don't know what the warranty is on them through other places, but with costco, it's 3 year free replacement. if it dies within the first 3 yrs, return it for a full refund. after that, it's pro rated.