Mage: I can sum up the decision for Lead Acid Vs. Lithium in one word: Cost. And availability. Cost and availability. Two words. Cost and availability and simplicity. Three reasons: Cost, availability, simplicity. Lithium batteries are not widely available and comparable in cost, and commercially available things like battery chargers & controllers are not necessarily compatible with them, off the shelf. For this reason, almost ALL EV conversions still use lead acid. This car will have regenerative braking - the motor will become a generator when decelerating and put energy back into the batteries. One advantage of L-A is that they can take in huge amounts of energy in the short term, an advantage for regenerative braking. If I had it to do over again, I would consider Absorptive Glass Mat (AGM) batteries rather than flooded Lead Acid. But the batteries I chose have about the highest energy / Lb and the highest energy / Cu. Ft of any commercially available battery.
Nobb: The batteries are 130 Amp-Hour which at 240 Volts = 31 Kilowatt-Hours. The motor is about 43 KW (peak) and can maintain about 18 KW continuous. That equates to about 41 HP peak or 24 HP continuous. But it doesn't equate to a car motor. A 3 phase AC motor like I'm using has high torque across nearly it's entire operating range. It makes in the 50-60 ft-lb across the entire range.
The truth is I really don't know what the range will be. I do know it will depend a lot on driving style - hot-rod starts and stops will have a huge effect on the range. I plan to test it and take measurements of the range.
One reason I bought the particular car I did was that it had been set up for autocross racing. The suspension is MUCH harder than a standard car - very heavy springs. I'm not happy about the weight in the back and I don't know how it will handle. But I don't expect RX-7 handling. I just want it to work! I do hope the mileage will be greater than 100, but the only way to find out is to drive it some.
Thanks for the questions - as this project moves on, I'm getting pretty excited to try it out!