18650&21700 Lithium ion Battery Cells

18650/21700 Battery is a lithium-ion rechargeable grade a battery. The first 4 digits of the designation “18650” indicate the physical dimensions while the 5 th digit indicates it is a cylinder cell.

The standard 18650 cell is 18mm around by 65mm long. This type of battery is very common in applications such as laptop battery packs, flashlights, electric vehicles, cordless tools and various other devices that require portable power.