JamesD

Strong Growth in Lithium Demand to Power FMC Corp., Rockwood Holdings

The number you really want is amp-hours (or Coulombs). Every electron coming out of a battery comes from a lithium atom, so the closest correlation with lithium content will be in the amp-hours. You need to divide watt-hours by the voltage of the batteries to make the comparison.

If the voltage in the auto batteries is 350v, that cuts down quite a bit on the ratio. Nonetheless, since you can run a laptop from the cigarette lighter plug in your car, there's obviously a vast difference in capacity. My gut feeling is that we're talking about a 50-fold difference.