It would appear that there is no significant difference in capacity and voltage between these two examples. Learn about charging 6 volt batteries in series with 12 volt charger by following these steps.

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2 6 volt batteries in series vs 1 12 volt. I have 2 6 volt batteries now and they are more than 5 years old. The 6 volt batteries you currently have is set up in series. So i will change them soon. However i could use 3 12 volt batteries in parallel. Fuses or circuit breakers for each battery should be used to prevent a good battery discharging high current into a failed battery with a shorted cell for example. It seems they dont last as long as they used to.
Four 6 volt batteries wired into a series parallel configuration as another example will provide about 450 amp hours of use. Jump start procedures preparing your batteries for winter advantages and disadvantages of using two 12 volt batteries connected in parallel or two 6 volt batteries connected in series. Two 100 amp hour 6 v batteries in series have the sam capacity as one 100 ah 12 volt battery. My battery box has room for 3 batteries. Because it is important to shave weight wherever possible so you can improve the fuel efficiency of your rv having lighter batteries is always a good idea. So my choices are 2 6 volt or 3 12 volt batteries.
Two trojan 6 volt batteries wired in series yields about 225 amps at 12 volts. Charging batteries again can save you time and energy instead of buying new batteries. To switch from two 6 volt batteries to a single 12 volt you can simply connect all power to the positive terminal and the negative connects directly to the frame ground. Obviously i cant use 3 6 volt batteries in series. A 6 volt battery weighs significantly less than 12 volt batteries so much so that a single person will have no problem handling it. Charging two 6v batteries in series helps you understand what happens on a physical level when charging batteries.
Two 12 volt batteries in parallel have twice the capacity of the six volt series but the 12 volt parallel connection is a dangerous fire and explosion hazard. The more batteries you add obviously the more current youll be able to store.