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If I remember correctly 270-300 watt hours per mile is pretty common for an EV, lead acid batteries shouldn't go below 50% discharge, my most recent EV battery pack was around 6 watt hours per dollar of usable battery, or $50 per mile of range for battery cost for lead acid, the last sale Email that I got from foxx power their cost for lithium batteries is around 2.1 watts per dollar or $143 per mile of range for battery cost.
Even if you have a source for free batteries (scrap value is 12 cents per pound last I called so $8 per T105 battery) and can find the space for the extra batteries with your reduced capacity... at some point you are going to haul around so much lead it's not going to be worth it.
It's going to be cheaper to move, even at $2,500 budget it would most likely be cheaper to move.
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