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Most batteries can not handle the kind of electrical draw that is needed to power a car, my 1,400 pound car draws as much as 25,000 watts when starting from a dead stop, 600 amps for a second or more at 48 volts, most if you try to draw that out of a laptop battery, or even 10 laptop batteries they will melt, start on fire, or produce some other thermo event.
Dewalt packs are A123 batteries, they have better specs then lap top batteries but still if I remember correctly 75 amps out of a single 33 volt (labeled as 36 volt) pack can be drawn for a second or more, of course the BMS does not allow that kind of discharge, it's limited at around 15-20 amps, I could see having a few deep cycle lead acid starting batteries and a lithium battery that keeps them charged, so the lead acid would act as a buffer, that could work.
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