Drones and general aviation are obvious markets. Batteries like this will initially be limited in supply and expensive. So targeting them at niche markets makes

Drones and general aviation are obvious markets. Batteries like this will initially be limited in supply and expensive. So targeting them at niche markets makes sense. There are already a few certified planes flying and a few drones that are getting close to that. E.g. the Beta that flew in the New York area last week. And there will be a lot more in a few years. Current state of the art is a usable but not very long range for electrical planes. 200-250 miles seems to be the maximum range currently and some planes barely get to 100 miles. Something that not everyone seems to grasp is that planes expend a lot of energy going up but then a lot less cruising from A to B and they can actually recover some energy going down. So, increasing the battery capacity without increasing the weight means you extend the cruise phase of the flight. The take off energy expense is kind of a constant that is mostly dependent on the weight. Doubling the capacity might extend ranges to more than double what they are currently. A 1200 wh/kg aviation battery would more than quadruple current ranges. That's nice of course if you can get to 1000+ miles. But a more logical thing to do would be to cut the weight by e.g. half and still more than double the range. Also, current electrical planes sacrifice a lot of their maximum takeoff weight for batteries. Losing half that, increases their useful payload size and utility considerably. You can turn a four person plane into an eight person plane, for example. And still extend the range a little too. I think Elon Musk called out 400wh/kg as the threshold that he considers as a minimum. This more than triples that. More than because of the outlined effects on cruise.