Hi there!

No, not green in real life. As white as they come :wink: A normal 21700 does not work at all, you would have to convert it first, getting the negative terminal to the top of the cell. One mistake and the battery might flame out on you. This is why I did not explain this light as being a real outdoor/emergency tool, the Armytek fits this role much better. Having battery options is important if you are out there, in fact you would maybe go for a loadout that allows you to swap cells between devices/lights. The Olight M2R Pro throws a wrench into such plans which is a bit of a shame as this light otherwise shines on many levels. If you need a powerful light on the job and use it often on the Olight is just so very efficient and comfortable to operate that I can overlook this downside.