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18500 batteries are a type of rechargeable lithium-ion battery that measures 18mm in diameter and 50mm in length. They are similar in size to a AA battery, but they offer much higher voltage and capacity, making them an excellent choice for high-performance applications that require a compact power source.

18500 batteries are commonly used in a variety of devices such as flashlights, laser pointers, portable radios, and other electronic gadgets. When purchasing 18500 batteries, it's essential to select ones that are designed specifically for your intended application, as the performance characteristics of different batteries can vary. It's also crucial to use a dedicated charger designed for lithium-ion batteries to ensure safe and optimal charging. With proper care and maintenance, 18500 batteries can provide long-lasting, reliable power for your favorite devices.