Show of hands: who's carrying an 18650 flashlight for EDC? Probably not many of you. But that's OK, we're here to tell you what it's all about and why it's so awesome. The 18650 lithium-ion battery—so named for its 18mm diameter, 65mm length, and cylindrical shape—is one of the most popular battery form factors in production. Its size and features make it ideal for electronic applications, like laptop and electronic car batteries, and even portable battery chargers.
An 18650's higher voltage, bigger capacity, and reusability make flashlights one of the better beneficiaries of its benefits. We're talking upwards of 1000 lumens in your pocket, runtimes measured in weeks and months (yes, months), and no longer having to buy disposable batteries which is always good for the environment.
Below we've rounded up 5 of the best 18650 flashlights on the market. They're lights that make full use of the battery's capabilities but remain compact enough for everyday carry. You can go ahead and put away those AA, AAA, and CR123A lights—you won't be needing them from here on out.