Multicolor LED Shutter Glasses

Very disappointing. Ordered 3 dozen of these for a middle school social as a fundraiser for my wife's 8th grade class. They were in high demand and we could have easily sold all of them, however, THEY DIDN'T WORK! Could only get 8 glasses to actually work. The middle schoolers were disappointed and so was she. She brought the remainder home to me for return to Sure Glow. Using a small screwdriver and removing the battery cover, I discovered that there is a coating of some sort on the batteries that prevents a good electrical contact. By cleaning the batteries, I was able to get most of the glasses to work, however, parents selling these at a social should not have to go to such extremes. There is no additional opportunity to sell these this year, so the 8th grade class is not only out the money paid for this defective product, but they missed a great opportunity to make some extra money for their class trip.