Raj,
The B3121 is bench tested at the time there built for you. Mine say's 12.95 Volts and 873 CA. That seems more than adequate in my opinion. Will it work as stated over time? Don't know. It's an AGM based battery as well. Do they require different care? Yes. That's why I purchased their charger as well. Looks like a Cetek type to me and I may hard wire it into the car so I can just plug it in when not driving the car. I will recess the battery in the trunk and make it large enough to accommodate any battery.
Bought the carbon one, well, just cause I thought it was cool. If it works I save a few pounds, If it doesn't, lesson learned and I buy another brand. Price of education.
I have had some Optima's and not had them last. Maybe because of operator error. I'll have all the electronics of a modern car installed so I will report back on it's performance over time.
I'm sure there are lots of pro's and con's all over the internet on both brands. Just thought I give this a try.
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Jason
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