Secondary Agm battery in trunk, does cranking amps really matter?

[Spadepro22]

Haven't gotten a clear answer yet, does the cranking amps really matter since this is going to be a agm secondary battery in the trunk? This is just for street application only, just looking for something to help the amp without spending a fortune.

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[THATpurpleKUSH 5,000+ posts]

Cranking amps are relevant with starting batteries, you need to use a deep cycle not a starting battery. Look at amp hours instead of cranking amps.