Brand new milwaukee cordless drill 18 volt throws sparks and burn smell straight out of packaging.?

on ebay I bought a Milwaukee 18 volt cordless 4 pack for a decent price. It was in the original packing and you could tell it had never ben used. I charged the battery and squeezed the drills trigger. Orange sparks shot every where out of the back vents and I smelled somthing burning. Could it be fixed? Is it the drill brake hanging up? Should I try to get my money back from the seller? I would rather fix it than return it.