Originally posted by Joe_Black
The marine Blue Top discharges and cycles differently than the Red or Yellow and wouldn't be very suitable for auto use.
Got any details on the difference? All the research I did prior to making the purchase was that marine batteries tend to have lower CCA's but higher sustainable output vs automotive batteries. Since Optima spells out the CCA's for each model and the marine batteries of interest all have equal or higher CCA's than the automotive, that issue did not apply. Additionally, most of the literature that I found used the terms marine and deep-cycle interchangeably. Thus leading me to conclude that the yellow tops are just a marketing difference to have officially labeled automotive batteries for automotive stores to sell.