Vire Flashlight / External Charger
These flashlights use 18650 batteries! You CAN use your saber battery in this flashlight! (Tho, you cannot use the flashlight battery in your saber, it's a little too short.)
You can also charge the flashlight via the built in micro USB port! Essentially, it can be used like an external charger, that doubles as a flashlight!
It's got 4 modes, Bright, less bright, side lights, and flashing side lights. It also has a magnetic base, and a telescoping head, to focus the beam!