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 is a lithium-ion battery classified by its size, which is slightly larger than a AA battery. The advent of the 18650 brought along a new age of li-ion power which continues today, providing high-current discharge with a superior capacity compared to other rechargeable chemistries. 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 21700s and 16340s.

What Uses 18650 Batteries?

Many devices use rechargeable 18650 batteries, including flashlights, solar lights, ebikes, cordless power tools, and much more! At BatteryJunction.com we carry a wide selection of flashlights that are powered by 18650 batteries, found here.

What Brands Make 18650 Batteries?

As the 18650 has become such a popular power source for flashlights, many flashlight brands themselves are making 18650s. These brands include Olight, Nitecore, Fenix, and more. It is worth noting that some brands may have proprietary batteries with custom features that work best in their own flashlights, so it’s best to pay attention to compatibility when purchasing from these brands.

How Do I Charge an 18650 Battery?

Many 18650 batteries can be charged via built-in Micro-USB or USB-C ports. At BatteryJunction.com, we can support your USB charging endeavors with our selection of USB chargers and a wide range of USB cables. If your 18650 doesn’t have built-in charging or you need to charge lots of batteries at once, we recommend a lithium-ion smart charger, which can be found here. Smart chargers will give you the freedom to set charging parameters compared to built-in charging ports. Overall, it’s crucial to choose an 18650 battery that is protected for the safest experience during charging, no matter how you power up.

Looking to Buy Batteries in Bulk?

If you need to buy 18650s in bulk, we have you covered. Filter this page to find a selection of bulk 18650 batteries, fill out a wholesale request form, or simply contact a member of our sales team directly by phone at (860) 767-8888, or email us at sales@batteryjunction.com.