X2 with above CCA is the ability to start your motor so bigger is better also good for winch duties.
AH is mainly on a deep cycle battery, most use as an AUX battery to run accessories. N70 is the size you want
I think a 320 mm casing from memory. 100_110 AH deep cycle is plenty for most 4x4ers.
there are larger batteries available, but these would be for serious expeditions with solar applications
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