Is it true that battery energy density improves 5-8% per year? Does this represent an average or is it a consistent trend each year? Do these improvements increase the cost? What has
![After electric cars, what more will it take for batteries to change the face of energy? | The Economist After electric cars, what more will it take for batteries to change the face of energy? | The Economist](https://www.economist.com/sites/default/files/images/print-edition/20170812_FBC444_0.png)
After electric cars, what more will it take for batteries to change the face of energy? | The Economist
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