Batteries are batteries right? Sure, and computers are computers, and tires are tires. Oh, what’s that? You say there’s a big difference between a Mac and PC, and tractor tires and car tires? Well, so too there are big differences between the different types of batteries that are available. Obviously the physical sizes are different like your AAA’s and your D’s, but the differences go deeper. The construction and composition of the charge generating materials can be significantly different as well.