If you are uncomfortable wiring 6V you can always purchase golf car durability in a 12V battery.


The battery on the left is a golf car 12V battery. This Duracell GC12 is purposely placed next to a Group 31 12V battery. While it's certainly taller they will usually fit where a Group 31 did and often a where Group 27 did. The BCI group size of GC12 is far too often over looked in the marine industry.


GC12 batteries are usually between 145Ah and 155Ah in a 12V case:


Deka / East Penn = GC12 (the Duracell pictured is an East Penn GC12)
Crown = CR-GC150 or CR-GC155 (Crown's are very attractively priced)
Trojan = T1275 or J150
Interstate = 12VGCUTL
US Battery = US 12VE XC2 or US12V XC2


Once Again the deep cycle *GC12 wins the price battle over a "light cycling" battery.


GC12V - 150Ah = $167.25/$1.12 Per Ah > 1200 50% DOD Lab Rated Cycles


Group 31 - 130Ah $159.95.00/$1.23 Per Ah > 525 50% DOD Lab Rated Cycles


2 X GC12 = 300Ah @ $334.50 > 1200 Lab Cycles


@ X G31 = 260Ah @ $319.90 525 Lab Cycles


*My local distributors pricing within the same brand.