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You don't need 900 amps of current to start your truck anyway. "CCA" is all marketing hype.
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I dont think so. Winters up here in canada will go down to -40, and that is when the "cold" cranking amps really count.
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Here it gets plenty cold in winter. I've always had good batteries but I've had customers with some pretty crappy batteries and they seem to start the vehicles just fine.
Keep in mind that the plates in the battery must be thinner to provide more current from a battery with the same phsycial size case.
Most of us here are using a group size 78 battery and the difference between the durability of an 875 CCA group 78 and a 1000 CCA model is pretty significant.
Comparing two batteries of the same physcial size, theoretically the one with lower CCA's is more durable and should last longer.
The warranty will probably be better on the latter though.