Batteries come in all shapes and sizes, but when you're specifically looking for a "B battery," it can be helpful to know some of its synonyms. These batteries are also known as PP3, MN1604, and 9V batteries. They are commonly used in smoke detectors, remote controls, and guitar pedals. Despite having different labels, these batteries all share the same voltage and function. When shopping for replacements, be sure to double-check the specifications and confirm that the device is compatible. By being knowledgeable about different names for the same product, you can ensure that you have the right battery for your needs.