Your old batteries have a usable capacity of 100ah (assuming they are configured in parallel and you don't draw them down below 50%). Upgrading to 2 lithium 100ah batteries, again assuming they are wired in parallel, would give you 200ah total with a safe usable amount of 160ah ( 80% 0f 200ah ). So this would give you more initial capacity. You would need to check the model of your converter/charger to ensure fit can handle the charging profile of the lithium batteries as it is different than your old lead acid batteries. There are many lithium options, you'll have to do some research to pick a brand you're comfortable with. I would check out the SOK batteries, they get good reviews and are quite a bit cheaper than BB. I'm not disparaging BB, they make a fantastic product, but they are pricey. If you don't want to go the lithium route you could buy 4 6v deep cycle batteries, wire them in series/parallel and get 200ah+ of usable capacity. Lithium gives you longer life, less weight, more usable capacity, quicker charge rates but they are not the only option.
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2020 294RL
2019 GMC 3500HD 6.6L 4x4 SRW
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