First let me say; I'm a D.C. Power Engineer and I've worked with almost every generation of sealed batteries in the last 20 years. The size and scope of my operation is vastly different being that my systems are 14.8v 40,500 amp systems (yes the amperage numbers are correct). The average cost of $200,000. is just the batteries in one of my plants, not counting the rectafication and converter systems/equipemnt and the UPS Systems.
DC power is funny stuff but some of the laws of physics just don't change in this reality. Anyone who has ever grounded a screwdriver or wrench to just a 12v car battery already knows that.
In the begining GHB and Johnson were the first to make sealed gel cell type batteries and at the start they were simply awful. When they got hot they exploded, puked acid gel everywhere and worse. I've spent many hours cleaning the room and equipment up after an incident.
Today many years later they are solid and relyable, seldom leak and I haven't heard of an explosion or fire in many years.
Now to the "Optima" sealed gel cell battery... Awsum comes to mind for a descripter, and for $109. they are one of the best buys on the market today. That is in my never to be humble opinion, of course.
The real benifit is that they are smaller and able to be placed in any orentation, up, down, or sideways it just doesn't matter and it has the reserve cranking amps needed for some of the older electrical systems.
We have used them for 8 years in various race cars and never had a battery failure due to rough treatment, vibration, heat and generally harch environments in the desert or road course.
Today the added expence (pennys a day) for an Optima battery is the best dollars spent on your car's, trucks and RVs. Then again it your equipment and you do as you feel is best.
[ 11-23-2003: Message edited by: Jim Weatherford ]</p>