The 18650 battery is a type of lithium-ion battery that is commonly used in a variety of electronic devices, such as laptops, power tools, and flashlights. The "18650" refers to its size: 18 millimeters in diameter and 65 millimeters in length.

The [url]18650 battery 3000mah[/https://tiitan.com/product/tiitan-3000mah-18650-3-7v-1c-cylindrical-lithium-ion-cell/
] indicates its capacity to store and deliver electric charge. It means that the battery can supply a current of 3 amps for 1 hour before it is depleted. In practical use, the battery's capacity may be affected by various factors such as temperature, discharge rate, and age, which can reduce the actual runtime of the device it powers.