Here are comparisons of two pairs of batteries -each pair exactly the same weight. Each comparison has a pair of 6 volt batteries in series - compared to a pair of 12 volt batteries in parallel. Note that are all pretty much equal. I also added on big 12 volt battery that has equal weight to two of the others. It beats them all.
Note that for a fair comparison, you have to compare batteries of equal weight. Stating that your best expert friend Joe Blow changed his 6s with 12s and does better - is useless nonsense.
First comparison:
BCI type 4 47 lbs. wet weight 6 volt CCA 1000 amps RC 270 minutes
BCI type 3ET 47 lbs. wet weight CCA 500 amps RC 120 minutes
Two of the type 4 six volt batteries in series equals – CCA of 1000 amps and RC (reserve capacity) of 270 minutes.
Two of the type 3ET twelve volt batteries in parallel equals – CCA of 1000 amps and RC (reserve capacity) of 240 minutes.
Second comparison:
BCI type 7D 60 lbs. wet weight. 6 volt. CCA 950 amps RC 350 minutes
BCI type 17TF 60 lbs. wet weight, 12 volts. CCA 530 amps RC 150 minutes
Two 7D 6 volt batteries in series = CCA 950 amps and RC 350 minutes
Two 17TF 12 volt batteries in parallel = CCA 1060 amps and RC of 300 minutes
Also - here is just one big 12 volt battery that weight what the other two would weigh . .
BCI type 908D, wet weight 120 lbs. 12 volts. CCA 1375 amps RC 430 minutes.
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