See the New Drone Lithium-Metal Battery Take Flight 

A Massachusetts-based startup says it’s doing something that no other company has been able: sell lithium-metal batteries commercially. And they’re appearing first in drones. SolidEnergy Systems, a spin-out from MIT, has developed a battery that it says has double the energy density of current lithium-ion batteries. That means that a battery from SolidEnergy Systems could be half the size of a standard lithium-ion battery and hold the same amount of energy, or it could be the same size as a lithium-ion battery and hold twice as much energy. For drone…

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