Take a look at LifeLine batteries...
I posted this awhile back, but will repost for the sake of the current conversation....
"The Odyssey Line of batteries appear to be quality batteries, but to me their specifications seem to let them down (size verses capacity) when compared to other quality AGM batteries available. The PC1200 is the closest in size to say a yellow top Optima, but only carries a 78 min reserve capacity in a similar size/weight package as the Optima which carries a 124 min reserve. To me, reserve capacity is the important number, and a 47 minute advantage in a similar sized battery is a HUGE difference. The PC1700 specs are better, but they are huge next to an Optima. I’m new to Land Cruisers, and still looking for the right one to own. If there is room to fit two PC1700’s under the hood that is great, I never had that much room under the hood of my Discovery. Two PC1700’s will give you 284 minutes of reserve, pretty impressive. As I said, Reserve time to me was always the most important in building a vehicle that will travel far away from civilization.
If you are really looking for a high capacity set-up, consider this. I didn’t get around to trying it in my Discovery, but check out Lifeline Batteries (
http://www.lifelinebatteries.com/marine.asp ) model GPL-4C. Lifelines are well respected (in commercial applications) AGM deep cycle batteries. The GPL-4C is approximately the same length and width as an Optima, but slightly less than 2.5” taller (I don’t know how much height the Crusier has to play with, but these would have just barely cleared the hood blanket on my Discovery), and is a 6 volt battery. By placing two in series (instead of parallel) you get a 12 volt battery with, are you ready for this, 492 minutes of reserve time (standard 25 amp draw test). That’s roughly the equivalent of four Optima Yellow tops in parallel. Plenty of juice for winching, and would probably run an ARB/Engle fridge for a week or more! That is also an extra 208 minutes of reserve over
TWO PC1700’s. How is that for reserve capacity? I’ve seen several photos around this site of PC1200’s used in Parallel. To me these have far to little reserve capacity, with two of them coming I with 128 minutes LESS reserve time than a single PC1700. Just something else to consider, if they will fit. I’d love to hear from someone as to whether they will or not…"
P.S. -- My Experience with exide products in general has been pretty poor, and Optima pretty random (some are awesome, some suck...)