On Thursday, April 21, 2016 at 4:56:52 PM UTC-7, son_of_flubber wrote:
Seriously. Will Tesla brand Li-Ion batteries ever find their way into aircraft propulsion?

Tesla battery packs are currently made up from standard Panasonic 18650 li-ion cells with off-the-shelf charger/protection circuits, the same as in many laptop batteries. Not magic unobtanium, just buying in bulk.