"Is not a question of the Optima (spiral) having a diferent resistence but the fact that resistance will not increase on parallel connections so if 1 battery
have 0,0025 ohms when you join it in a paralel group to have 12V and increase Amps ( parallel ) capacity"
One things wrong here: "resistance will not increase on parallel connections". No, and in fact resistance DECREASES with parallel resistors, including parallel batteries. Again, that's got nothing to do with Optima batteries in particular, it is universal.
Now, if you are comparing 2 Optima 100A 12v batteries combined in parallel versus 2 conventional 200A 6V batteries combined in series--that's two totally different configurations. Again, nothing to do with Optima, just a different battery
bank configuration, which will produce different charging
But if you are paralleling two larger batteries versus six smaller batteries, all 12V, then the effective resistance of the banks will depend on the internal resistance of the batteries--complicated by the formula for parallel resistance:
Better performance? I wouldn't know without running the numbers. And considering that when you go from 2 batteries to six, you've got three times as many cables
, lugs, crimps, terminations...
Ideally you do what the fork lifts do. Use six 2.2V cells and build one real battery from them. You won't find cells that size at your local chandlerie though.<G>