The $200+ difference would buy a lot of gas and 30lbs isn't going to make a big difference. I would stick to what works or try to source a less expensive lithium pack.
Used Nissan leaf cells are around $350 On fleabay. 4 cells at 3.7v per cell and roughly 80ah. Might take some extra parts but a much larger battery.
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Last edited by ksa8907; 12-11-2017 at 11:42 PM..
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