Hi guys, I see your point and looked up that 6V golf cart cell - MK 8AGC2 - (
http://www.apexbattery.com/mk-8agc2-...atteries-.html). Pretty rugged cell for a sealed lead acid battery, no venting problems and thats a plus.
You mentioned that two 6V batteries gives you 1712 minutes a 15 ampere load and two 12V marine cells gives you 680 minutes. The math might be wrong because you're comparing apples and oranges since the batteries are not rated with the same amp-hour capacities. The amp-hour rating when the 6 volt cells are placed in series to give your 12 volt circuit stays the same, or is an average of the total amp-hours divided by the number of cells so you really have 856 minutes reserve with the golf cart batteries.
Its been over 25 years since my basic electronics classes but I remember that two 12V marine cells giving you 340 minutes each when placed in parallel give you a total of 680 minutes or becomes the sum of all cells in parallel. If you had found a 12 volt battery rated at same 220 A/H as the 6 volt cells you would be able to enjoy the extra power. So, for the same battery footprint you get more longevity on the lights at night with 12 volt cells in parallel.
Thanks for the bowtie comment, I drew that avatar myself for a diesel forum we belong to
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