Posted by jdemaris on October 05, 2008 at 07:22:45 from (67.142.130.44):
In Reply to: Batteries posted by 550Doug on October 05, 2008 at 04:50:56:
A few more general comments. Any good deep cycle battery, when compared to a standard cranking battery of equal weight - will have about 80% of the instant cranking capacity and much more reserve. That means it can crank longer.
Keep in mind also - that when it comes to battery warranties - they don't mean much unless you've got a local dealer that stocks them. All the companies charge shipping for warranty - if a dealer does not stock. This makes many warranties kind of useless. It's also a good reason to buy a local automotive battery - cheap - with a 5 or 7 year warranty - when possible.
Keep in mind that many battery companies market their batterys by cold cranking amps, or just "cranking amps" which is different. But, usually, when a battery is built to give more cranking amps - it sacrifices reserve - or - how LONG it can crank. I.e., they "rob Peter to pay Paul." It's kind of a scam in many cases. Best way to compare is by battery weight - that will tell you a lot.
In the situation with absorbed glass mat batteries - (AGM) - to me, it's mostly hype and overpricing. Much of my experience has been with large battery banks for solar electric use. Also with RVs and - I have over 30 tractors and 12 cars and diesel trucks. Dollar for dollar, AGMs are just-about-always a losing proposition - often - over time - costing more than twice as much as old-fashioned FLA batteries (those with liquid acid).
Now - with the Optima "spiral cell" AGM batteries? Look at the price, warranty, and actualy battery specs. Many dealers don't post all the specs - just the cold cranking amps.
Here is one example of an Optima 6 volt compared to a Trojan 6 volt battery. With the Trojan, you get twice the battery as less cost - and the Trojans usually last 7-10 years.
Redtop 6 volt - Part #: 6V-850 $165 on sale, $200 list price. Voltage: 6V, 800 cold cranking amps, Reserve Capacity: 110 minutes. Dimensions: 10"L x 3 9/16"W x 7 13/16"H 12 month replacement warrany, and 3 year total prorated warranty.
Trojan 6 volt, Part # T-105, $115 on sale, $135 list price. This is a GC2 type battery. Voltage: 6V, cold cranking amps not rated, but tested at 1200. Reserve capacity is 447 minutes (four times the higher priced Optima). 220 amp hours. Dimensions: 10 3/8” L X 7 1/8” W X 10 11/16” H 12 month replacement warrany, and 3 year total prorated warranty.
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