You're right on the money. Granted, it's a movie - but that's exactly what happens in I Am Legend. They modify viruses to cure cancer, and because of the percei

You're right on the money. Granted, it's a movie - but that's exactly what happens in I Am Legend. They modify viruses to cure cancer, and because of the perceived benefit, the risk is overlooked. The virus is tried, and it turns out to be highly contagious and deadly. Moving back to the battery, what if there was an accident / spill, and the same genes that made the battery acids causes some infection in humans or even live-stock? Doesn't that come to the writer's mind at all?