The Optima Batteries are no doubt the top of the line and of course you pay the price for it. The draw back with the gel batteries is that when they go out it is dead to a negative charge quickly. There is no slowly losing power in them.
As well I like the Interstate Line. Just hard to find when you need one quick.
I tried something a little different this time and replaced all three of my good batteries with three new Wally-World Everstart Maxx 29 Series Dual purpose Batteries. Dual purpose batteries have not caught on yet for some reason that I can not understand. Dual purpose batteries will recharge much faster and will hold their charge much longer than I can run them. They have a three year free replacement with no questions asked from any Wal-Mart @ 24/7.
The reason I went to Dual purpose is due to an awful experiance last February. I was fishing at night up about a half mile below the nuke plant. It was at night and the temps were below freezing. (Yeap, I was the only fool out there but I was catching the heck out of the crappie and Bass) I had not ran my big engine for hours but being that it was dark I was running my lights, pumps, instraments and every thing connected to my starting battery. Starting batteries are not designed to handle that kind on load for hours without showing signs of losing power. I think that most all our boats are rigged to put all the instraments and assecories on the starting Battery. When the entire top of my boat Iced over, it was time to go. Eerrrrrnnk-Eerrrrrnk !!! Not enough power left in my starting battery to crank my cold engine. (Fortunately I was Up the Creek) As many of you know, a deep cycle battery will not put out the quick power to start a big cold engine. So after switching the wiring around, that did not work either. I was alone so I could not hold a temp jumper wire to boost the power up to 24 volts in a manner that would not damage my electrinics..... Sooo, I trolled all the way back to Chester Frost ramp. Hours later I was at the ramp. No fun loading a 21' boat onto a Drive-on trailer with no power either.
I was sure that I would not let that happen to me again. And besides, I take my boat out up to Twelve miles offshore in the Ocean. How would that be out there in the strong tide currents??? Scary thought.
The dual purpose batteries will let me run everything on my boat for hours and then will spin my engine with no problems. In the event that I did have problems with the battery that is used as my starting battery, I have two more just like it that I can connect to.
As far as lasting power using dual purpose batteries for trolling. A couple week ago, two of my hugh hunting buddies and I were running up the river from Grasshopper to Hiwassee Island to deer hunt. It was very cold and the fog was very thick. My sixty gallon fuel tank gauge showed that I had over a quarter tank. I found out that my fuel gauge was wrong, very wrong, We ran out of gas right at the Hwy 60 bridge. That is about 4 miles from Grasshopper ramp. I trolled my over-loaded 21' boat with my 70 lb thrust Rip Tide all the way back on high. I was concerned about having enough power to get back while trolling sinse I had not recharged my batteries for the last several trips. It was almost a Two hour troll at a constant 2.8 MPH. emoEek We made it! emoSmile
We gassed up and went back hunting anyway.
When I got home that evening I tested my trolling batteries to see how far I had ran them down. Believe it or not, they were still holding more than 80% of their power.
I can tell you that it is dual purpose batteries for me. If I were you I would at least consider a Dual purpose for your starting battery.