An equally important aspect is how attractive it remains to people over its lifecycle.
To drive home his argument, Harper remarked its rare to see century-old vehicles plying on the road.
Harper said the proposed battery requires strict environmental controls to deliver on its 100-year service promise.
MF3d / Getty Images
Dr. Harris also cautioned against predicting lifetimes beyond the actual testing time.
Just_Super / Getty Images
Emilija Randjelovic / Getty Images
