AG11 Button Cell Battery (LR721, 362, SR721) The AG11 is a compact 1.5V alkaline button cell battery designed for small electronic devices. With a diameter of 7.9 mm and a height of 2.1 mm, it fits perfectly in watches, calculators, laser pointers, toys, medical instruments, and other compact gadgets. Known for its long-lasting power and reliable performance, the AG11 is a cost-effective replacement for several battery models. Key Features: Voltage: 1.5V Size: 7.9 mm (diameter) x 2.1 mm (height) Leak-resistant and durable Long shelf life for dependable backup Also known as: LR721, SR721, 362, SG11, V362, D362, GP362