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Odyssey or Optima, exactly which one depends on what you want to run really (stereo, winch, frig, lights...?). Below is my Optima Yellow, it's a deep cycle battery which is good if you running a winch. I took it to a highend stereo install shop to have it custom wired because they don't make a reverse terminal and my battery terminals did not accomodate it well. Part No. Yellow 34/78 Model No. 989237 CA - 870 CCA - 750 AH - 55 RC - 120 Cost - $166 including tax at Costco 888-8OPTIMA
Exide makes a spiral wound battery like the Optimas that goes under the Orbital brand name. Every bit as good a battery as the Optimas and Odysseys. If you're looking for a standard lead acid battery, the Die Hards and Interstates are most likely the best.
the two most important things to look for in a battery are CCA rating and how serviceable it is. CCA is Cold cranking amps which is very important to how a battery behaves in cold weather. I would not use anything lower than 575 cca in a GC. While having a "sealed battery" may be great in that you do not have to check the battery fluid level, If you have an electrical problem in the vehicle that requires repeated charging or if the vehicle itself is overcharging, causing the fluid to boil out, in a sealed battery there is nothing you can do to restore the correct level...so it gets thrown away. Case size is the limiting factor in battery choice as is the position of the terminals. (without modifying either the battery tray or the vehicles cables). Therefore, considering all of the above, You should buy the battery that has the highest CCA rating you can afford that is serviceable, that fits without modifications to the tray or cables. If your present battery is going dead on you, I strongly recommend that before putting a new battery in there, find out the reason it is going dead. If there is a problem with your charging system, replacing the battery will not correct that.
You'll probably find what you need for around the $100 range. Normally you will have 2 or 3 strength choices from about 600 CCA - 850 CCA. CCA, is "cold cranking amps". Higher the number, better it will turn over when cold especially. Personally, for the sake of $20 or so, difference in prices, I will always go with the higher CCA, just for that added strength on cold mornings here in Canada, plus I always think, the less a battery has to work to do what is necessary, the longer it will last.
Somewhere on the top of your current battery you should be able to find a number followed by CCA. This is your battery rating, CCA stands for cold cranking amps and this is one area where bigger is better. If you are looking at replacing the battery then this number should be at least 500CCA or better, keeping in mind that it will have to fit in the battery box. Measure the width, length and height of the current battery and take these measurements with you as well as the current CCA when you go to buy a new battery. If your car has a lot of electrically powered options you should be looking for 750+ CCA. If, for some reason, you can't locate this number, then the auto parts store should be able to find it in their reference books. Hope this helps.
For the highest amperage in the smallest space this is likely to be your best solution as it is a gel core battery unlike your typical battery which is lead/acid and requires more space to create the same amperage.