 The Optima "Absorbed-Glass-Mat" AGM type battery uses a glass mat impregnated with an acidic paste, then rolled like a cinamon roll in a spiral. The individual 2 volt units resemble an old 1 1/2 volt dry cell, so three in series look like an old Hot-Shot 6 volt dry cell like we uesed to use on electric fences. The design is leak-proof and can be mounted upside down if you like, since it acts like a dry cell. Their 6 volt unit can yield 1000 amps, 800 CCA, which is the most power per pound I think you can find in a 6 volt unit. The photo shows the rather unconventional design in my VAC's battery box. They are much smaller, but also a bit longer, so they do require a bit of hold down redesign. I installed my first one in the VAC 3 years ago, and it is still performing like new. They are more expensive, but I was getting really poor performance and less than acceptable life out of the lead acid designs, and these really crank better. You can find them on the web buy googling Optima battery. They make marine styles, deep cycle styles, and conventional automotive sizes, but only this one in 6 volts. I have several in service now, and I will continue to replace all of my old lead acid types with these. They're just so trouble free. They even have a silvered alloy terminal which really resists corosion, but since they are no acid fumes collecting in the battery box, the terminals stay fresh all the time. Frank
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