2nd battery suggestions?

[AndyGiff]

Hi guys, been searching around for what I should get but answers are always conflicting. Looking for a second battery for a roughly 3500 watt system. I wont be playing it at all when the car is off. I already installed a Mechman 270amp alt and big 3 etc all zero gauge OFC, front battery is a yellow top Optima, all wiring is zero gauge OFC, battery will be in trunk. Normally only really crank it up when I am on back roads or the highway. Suggestions would be appreciated! Thank you all!

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[mahc 10+ year member]

Northstar