The 18650 is an A-type battery, 18mm in diameter, usually lithium battery. The third battery refers to a C-type battery with a diameter of 26 mm. The No. 5 battery (ie, AA) is one of the battery types, and generally refers to a size of 14 mm in diameter and 49 mm in height.
The number of 18650 in the 18650 lithium battery represents the external dimensions: 18 refers to the battery diameter of 18.0mm, 650 refers to the battery height of 65.0mm. Common 18650 batteries are divided into lithium ion batteries, lithium iron phosphate and nickel hydrogen batteries.
The 18650 battery life theory is cyclic charging 1000 times. Due to the large capacity per unit density, most of them are used in laptop batteries. In addition, the stability of the 18650 is very good at work. It is widely used in various electronic fields: it is often used in high-end glare flashlights. Power, wireless data transmitters, electric warm clothing, shoes, portable instrumentation, portable lighting equipment, portable printers, industrial equipment, medical equipment, etc.
The difference between 18650 battery and No. 5 battery:
1. Different sizes. Although the 18650 and 5 batteries look a bit like the two, the size of the two is actually different. The size of the 18650 lithium battery is 18 mm in diameter and 65 mm in length; and the 5th battery (in fact, the scientific name of the 5th battery is 14500) The rule is 14 mm in diameter and 50 mm in length. The 18650 is much larger in length or diameter than the No. 5 battery.
2. The voltage is different. The voltage of a lithium battery is generally around 3.5~4.0V, the most common being 3.7V; and the voltage of the fifth battery is 1.5V (non-rechargeable) or 1.2V (rechargeable).
3. Its working principle (internal chemical reaction process) is different.
4.18650 is a rechargeable battery. Most of the ordinary No.5 batteries are disposable batteries, which can be charged little even not.