18650 means 18 mm in diameter and 65 mm in length. The AA battery model is 14500, 14 mm in diameter and 50 mm in length. Generally, 18650 batteries are used more in industry and few in civilian use. The common ones are also used in notebook batteries and high-end flashlights.
The 18650 is a type of rechargeable lithium-ion battery. Lithium-ion batteries have revolutionized portable devices. They’re in everything, from our smartphones and cameras to baby monitors, fitness gadgets, and flashlights.
The name, 18650, refers exclusively to the size of the lithium-ion battery cell, but there can be minor variations even here. The 18650 has become the new gold standard for replaceable and rechargeable batteries.
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