Discussion on:

Someday: Power your EV with a battery by Thomas Edison

" Currently, most electric cars, such as the Nissan Leaf, run on lithium-ion batteries which can store a large amount of energy but also take several hours to charge. While Dais nickel-iron battery will never be able to power an electric vehicle on its own, it could help give power to lithium-ion batteries when they need to accelerate the car more quickly or make quick emergency moves.

With respect, the article would have been much more helpful if you had compared the power-per-unit-volume storage capability of nickel-iron batteries as compared with lithium-ion batteries.

If, as now seems clear from your later comment quoted above, nickel-iron is non-competititive volumetrically then it is very hard to see what point there is in using it as a 'booster' battery rather than simply using the volumetric space it would occupy to contain much more lithium-ion capacity!