John Lounsbury
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A Very Smart Plan for Federal Smart Grid Grants [View article]
Since John P. has not answered your question yet, I believe the main advantage of the lead-carbon batteries is about 10x cycle life over the traditional lead-acid batteries. Thus, with the $500 dropping to $250 vs. $200, you are paying for fewer replacement maintenance events over time.
John P., please correct and add to my comment (if necessary) when you read this.