First you are going to want to do "the big 3" before starting to think about a second battery. If after doing that you are still having a problem than you look at a second battery.
You will beed a battery, some type of strap down method, 4 gauge or much prefered by many 0 gauge wire going from your first battery to your second and the same thickness ground wire. Also a second fuse. Than you might want to look at a bigger alternator after doing these as this will increase the strain on your charging system.
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