18650 rechargeable lithium-ion batteries 2000mah
These are cylindrical, rechargeable lithium-ion cells named for their dimensions: 18mm in diameter and 65mm in length.
They are known for high energy density, long cycle life, and consistent performance.
Common applications include laptops, flashlights, e-bikes, electric vehicles, and power tools.
The batteries typically have a normal voltage of 3.7V and can be recharged hundreds of times.