Ok
12,000 W = 5,454v * 2.2 Ah (Using Shreveports Batteries) : Ok, I won't break it down by the cell this time but by the pack, there are 3 cells to a pack providing, 11.1v 2.2Ah so we would need 5,454v / 11.1v = 491 of these packs at a weight of .229 kg each = 112.439 kg * 2.20462262 lbs = 247.89 lbs for a cost of $4,170.
Volume would be, 103mm * 33mm * 24mm * 491 packs = 40,053,816mm3, I have no idea how big that actually is

anybody want to figure out what those dimensions look like?
Ok, if you take the cubed root of 40,053,816mm3 then you get 342.1485mm to a side, so a box made up of these packs would be roughly 34.5 cm to a side or a little over 1' X 1' X 1'. That would be 30 packs laid side by side 3 deep (103 mm * 3 = 30.9 cm) x 10 wide (33 mm * 10 = 33 cm), and stacked 16 high (24 mm * 16 = 38.4 cm) with 11 packs left to stick wherever.
Is that the smell of batteries burning or my brain

somebody better double check my math.