The Energizer Industrial D/LR20 Batteries are economically packed in boxes of 12 making them a perfect choice for bulk users such as private and government businesses around the world, Energizer Industrial D/LR20 batteries are perfectly suitable for general devices such as children's toys and other devices around the home. The Energizer Industrial D battery has no difference of performance in comparison to the standard Energizer D battery, but there is a difference in price due to the benefits of buying in bulk the Energizer Industrial works out cheaper and is a more environmentally friendly purchase thanks to less packaging to dispose of.