Also keep in mind, you are doubling one factor and expecting two factors to double from it.
"4 12v lead acid batteries and gets 25mph with a range of 12 miles"
I could see 8 being around 35-40 mph, or 20-24 miles at 25 mph, but you can't double both factors by only doubling the batteries.
Just hypothetical here, and not considering ANY losses, to double your speed and double your distance, one would need 16 batteries. Then we get into all of the great points everyone else is making, and other factors like temperature, and road conditions that can also affect your performance.
Not trying to burst your bubble, but just noting without any loss at all and just using math, you would need 16 to do that. Real life, with other factors, I would hazard a guess of at least 20 batteries at that rate, but under 32.
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