You don't want to string together a homemade pack of 18650 cells and put them in the wing of an aircraft, or anywhere else a fire will be particularly dangerous.
My point is, I'm sure there's a market for modular battery packs that have actually made these considerations, along with charging/discharging management, power electronics, insulation/cooling/heating and so on.
My point is, I'm sure there's a market for modular battery packs that have actually made these considerations, along with charging/discharging management, power electronics, insulation/cooling/heating and so on.