Two 3EH 6 volt batteries in series = 925 CCA and 350 RC.
Two 3ET 12 volt batteries in parallel = 1000 CCA and 240 RC
That of course can vary a bit with different brands. They are basically the same.
The two sixes give a longer cranking time.
The two twelves give less cranking time but a little more amps at first start. Probably a 1/4 volt higher at first cranking.
If it were me, I'd rather have the extra reserve capacity of the two sixes.
The CCA at 12 volts is a figure that shows how many amps a battery can supply at zero degrees for 30 seconds before it drops to 7.2 volts. The reality is - your starter is designed to crank at 9 volts and once voltage drops to 8, it won't do much.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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