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Quote:

Originally Posted by Sahara_Maverick (Post 2754807)

So, I guess the main question is if spending more on a marine battery just for the peace of mind is a good justification. That is, how many low voltage abuses a normal battery can take before becoming unreliable?

It would be difficult to put a number on it, but even after one time of over drain, the battery will no longer be able to fully charge. The more occurrences, then the less charge it can hold until eventually it can no longer hold a charge.

As an example...think of those power tool NiCad batteries. Pretty much everyone has experienced where you put one of those batteries on a charger and the light says it's "Fully Charged" but then you go to use it and it drains within 5 minutes of use. You put it back on the charger and after 10 minutes, it says it's "Fully Charge" once again. Well, that's because the battery can no longer store a true full charge. So the same type of thing happens in car batteries, and when you start draining a standard battery past that 50% full charge state, they start losing the capability to store a true full charge to where they drain rather quickly when you use them....just like the NiCad power tool battery scenario.

The Optima is also an AGM battery and is manufactured by Johnson Controls, although the plant that used to manufacture the Optima in Aurora Colorado has been shut down and the battery is now manufactured in Monterrey, Mexico.

Someone posted this earlier. I was not aware that this had happened and am very disappointed. I try to buy American-made products whenever possible. It seems it's getting harder and harder to do...

Quote:

Originally Posted by Lorrel (Post 2754971)

The Sears DieHard platinum is not a re-branded Odyssey. Odyssey is a brand name and the manufacture is EnerSys. EnerSys is now manufacturing the DieHard Platinum for Sears.
The Optima is also an AGM battery and is manufactured by Johnson Controls, although the plant that used to manufacture the Optima in Aurora Colorado has been shut down and the battery is now manufactured in Monterrey, Mexico.

For the OP, most manufactures recommend the use of like batterys when using a dual set-up.
As for types, the are three. The automotive starting battery, the marine battery, and the deep cycle battery. Although some use any one of these in the Jk, each has its purpose.
The automotive starting battery is pretty straight forward. Used for starting a vehicle it has thinner plates which provide a high burst of power required to start an engine. The marine battery has thicker plates and although it does not have the high burst for starting, the thicker plates allow for a longer capicity of power so it has a longer discharge rate. The deep cycle battery is normally used in industrail applications and farming operations and has the thickest plates, which allow for a longer discharge rate. It should be noted that in most marine and deep cycle applications batteries are normally used in sets or banks, to provide more power for starting equipment.
The newer AGM type, both sprial and non spiral although they do not have plates per se, still are manufactured in like manner as a plate battery.

You just said it your self lol Odyessy is made by EnerSys which makes die-hard platinum. Put the two beside each other and the specs are identical even the caps/writing etc/ just different colors.