This will not work with 18650 cells that have a flat positive terminal you will need use a button top. It will take 2x 18650 cells but will run them in parallel so output is relatively poor. It can be powered through the usb port which is slightly brighter so I just use a usb powerbank to run it instead of 18650 cells.

This will not work with 18650 cells that have a flat positive terminal you will need use a button top. It will take 2x 18650 cells but will run them in parallel so output is relatively poor. It can be powered through the usb port which is slightly brighter so I just use a usb powerbank to run it instead of 18650 cells.

This will not work with 18650 cells that have a flat positive terminal you will need use a button top. It will take 2x 18650 cells but will run them in parallel so output is relatively poor. It can be powered through the usb port which is slightly brighter so I just use a usb powerbank to run it instead of 18650 cells.