There is a company called Sion Power that claims to have 500 Wh/kg batteries [0]. "With supply dates beginning in mid-2021 for UAV markets. Broader distribution

There is a company called Sion Power that claims to have 500 Wh/kg batteries [0]. "With supply dates beginning in mid-2021 for UAV markets. Broader distribution for the Licerion-HE is scheduled for early 2022." [0]: https://sionpower.com/2020/sion-power-demonstrates-key-electric-vehicle-ev-battery-performance-requirements-in-its-lithium-metal-rechargeable-battery-cell-technology-2/ https://sionpower.com/2020/sion-power-demonstrates-key-elect...