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Now here's a guy that knows his battery business, and why I stick with a flooded cell not an optima.

"The gel cell and AGM batteries have no cell caps, only pressure relief valves, and require no maintenance.
When not in use they loose charge more slowly than the flooded cell type and can withstand being left in a partially discharged condition far better than a flooded cell battery. However, they cost more than a flooded cell battery; about 40% more for a gel cell and 80% more for an AGM. Also, neither the gel cell nor the AGM can last as long as the highest grade flooded cell brutes."

http://www.boatus.com/husick/techno01_01.asp (Full article)

MC
 

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We built an electric car in college and a majority of the data has AGM batteries #1 in performance and gel cell no that far behind. Plus they were able to withstand a little more abuse. However, we were drawing over 120V DC and some crazy amount of current. I believe 40 something Amps.

We ended up using AGM batteries that Lockheed donated. We also used these in the schools solar car.
 
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