The easiest way, in my opinion, is to get the biggest deep cycle battery that will fit in your current battery box. They last plenty long enough for daily/weekly commuting, and if you hardwire a charger in the car, plug it in every couple nights and no worries. This is what I'm in the middle of doing right now. I have the wiring harness, charger, and battery already. Weather protective door for the plug is the last piece of the puzzle.
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