Big if true. We always hear about batter breakthroughs, and then they just never break through the theoretical wall.

Halving batteries should surely cut the weight. If it managed to do that, we could one day see electric airplanes. The issue now is that batteries are so heavy that they require lots of power to carry them through the air. More power means more battery, which means more weight. The issue is cyclical. So batteries need to be much lighter, and maybe we’ll see some greener air travel in the future!