When you wire a battery in series you double the voltage but maintain the same amp hour rating as one battery. So two of these batteries in series would be 4 volts and 25 ah. A bank of 6 of these batteries in series would be 12 volts and 25 ah.
To get the 150 ah you would need to wire a bank of 6 in parallel, which would then give you 2 volts.
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