Optima yellow top in the frunk will more than suffice. make sure you use at minimum 2 gauge wire for the relocation. I recommend using welding cable.I started the post because I am out of space in the engine bay. I need room for my intercooler, heat exchanger(s) and pump. I am not really looking at it from a weight reduction standpoint. Completing the intercooler alone is worth WAY more from a performance standpoint than a few pounds removing a battery will provide. I expect to bump the boost up substantially with the chilled intake charge. Given that I'm in Colorado a large capacity battery for cranking in well below sub zero temperatures is absolutely required. I just need to figure out where to put it.