I am by no means an expert, rather a fisherman has been at it off and on for a long time and I have owned Optima's, interstate, Wal-mart brands, auto zone Auto Crafts?, for me a Optima Blue Top is a great starting battery and based upon what my voltage gauges read, the two Sears Diehard Platinum hold up about as well as any battery I have owned for trolling batteries. Typically batteries have so many recharges and the start to die regardless of brand...it seems the number of recharges and the timeliness of the recharge becomes the critical issue. It just seems the Platinum maintains a higher voltage reading longer to me