18650

18650 Battery Cells

Here is an 18650 battery next to AA, AAA, and CR123A batteries.

Length	65 mm
Diameter	18 mm

Specifications

Voltage	3.6V / 3.7V
Chemistry	Lithium-ion
Discharge Rating	1.5 – 10A
Capacity	2000 – 4000mAh
Rechargeable	Yes

18650 batteries can be charged with a compatible smart charger, while some feature a convenient Micro-USB or USB-C port.

Replacement Sizes

168A, 18650, 19670, Protected 18650, Unprotected 18650

What are 18650 Batteries?

The 18650 battery is a lithium-ion cell classified by its 18mm x 65mm size, which is slightly larger than AA batteries. They are often used for flashlights, solar panels, and other high-drain devices due to their superior capacity and discharge rates. 18650s come in both flat and button top styles, and usually boast 300-500 charge cycles. The term ‘18650’ refers to the measurement of the battery’s size in millimeters, in this case, 18mm x 65mm. It has a similar naming convention to other rechargeable lithium-ion batteries, such as 21700 and 16340 cells.

What uses 18650 batteries?

A host of devices use rechargeable 18650 batteries, including flashlights, solar lights, ebikes, cordless power tools, and much more! Here at BatteryJunction.com we offer a wide selection of flashlights that are powered 18650 batteries, found here.

What brands make 18650 batteries?

At BatteryJunction.com, we offer a wide selection of 18650 batteries made by different brands, including familiar names like Samsung and LG. Also available are 18650 batteries made by flashlight manufacturers from Olight, Nitecore, Fenix, and more. Many brands will create proprietary 18650 batteries that work best in select flashlights, so it’s worth paying attention to compatibility when purchasing from these brands. We also have a wide variety of flat top and button top 18650s for your freedom of choice to power up your way.

How do I charge an 18650 battery?

Many 18650 batteries have the capability to be charged via Micro-USB or USB-C ports. We here at BatteryJunction.com can support your USB charging endeavors with our selection of USB chargers and wide range of USB cables. If you’re looking to charge many 18650 batteries in a safe manner, we recommend using a compatible Lithium-ion smart charger, which can be found here. Smart chargers are especially crucial for charging unprotected flat top 18650 batteries.

Looking for bulk orders?

We got them! We have quite the selection of 18650 batteries available in bulk, perfect for your workplace. From Tenergy to Ultrafire cells, you have a wide variety of bulk options available. Some batteries even have bare leads or tabs for easy installation with the power system in your facility. Save money by buying in bulk here! Filter this page to find a selection of bulk-eligible 18650 batteries, fill out a wholesale request form, or simply contact a member of our sales team directly through phone at (860) 767-8888, or email at [email protected].