Posted by jdemaris on October 05, 2008 at 15:51:54 from (67.142.130.46):
In Reply to: Re: Batteries posted by Henry E. NC on October 05, 2008 at 12:24:04:
Stating that the US military uses the AGMs does not prove a thing. I can give you a long list of materials the US military uses that are far from the most durable and/or cost-effective. 6.2 and 6.5 GM diesels in Humvees is one of many examples.
I've got no doubt that some people do well with AGMs in certain applications. But - usually their cost is double that of a conventional flooded lead acid battery. I have seen many AGM failures in battery banks with solar electric systems. That because they are very intolerant to high charge rates. And, battery banks need to be overcharged once in awhile to "equalize" the batteries. Generally - for that type of use they are a losing proposition. Of all the failues I've seen, the banks were changed over to Trojan or Rolls/Surette FLA conventional batteries and did much better with less cost. I've got a bank of Rolls batteries here that are on their 12 year and still working fine.
The AGMs have advantages - especially in high vibration areas. But, they certainly do not outperform FLA batteries in all situations. And, at twice the price - they'd only be worth it if they were twice as good.
As to some posts claiming some conventional batteries only lasting a year? Those are anomolies. I can give many other anomolies to the converse and I've had many car batteries last 7-8 years. The OEM battery in my 92 Dodge Cummins-diesel truck lasted 11 years.
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