As far as I can tell, the cargo hold capacity of a 747–400 is around 750 cubic metres, or 750,000 litres. The size of an 18650 cell, as used by Tesla, is 65.2 mm long by 18.5 mm diameter. Rounding it up to a cuboid, you get a volume of 22.3 ml, or 0.0223 litres. so the 747 will carry about 33 million cells. They weigh about 45 gm each, so the total weight is in the region of 1500 tons. The payload of a 747 is about 160 tons, so your plane is never going to get off the ground.