The Stanford car will stow 10,000 lithium-ion batteries under the hood. A standard laptop typically has eight. Wired together, the lithium-ion cells--each roughly the size of an AA battery--will store enough energy to power an average home for four days, says Straubel. More important, the Stanford team calculates the pack could propel its car at an average 45 mph for 2,000 miles, smashing all previous EV records. The team hopes to have the car ready for road tests by July.