The 18650 battery is perhaps one of the best things to happen to the headlamp and camping flashlight industry in quite some time. These small AA-sized batteries can carry far more power than their traditional disposable counterparts, and best of all, they are rechargeable.
However not all of the lamps and flashlights that we looked at here offer compatibility with the 18650 3400 mAh. Some manufacturers prefer to use different styles or even their own exclusive battery styles, which means that it is quite important to check the product specifications to make sure that your new camping flashlight can operate off the right kind of battery.