We all know about Mjolnir, Thor’s legendary hammer of power. But there’s a new hammer in town and we bet it’s just as powerful! The Hammer of God V4 is the hammer in question and boy, does it pack a punch! Able to handle four 20700 or 21700 batteries at a time in dual parallel mode, this beast of a mod is not for the faint of heart. It seems Mjolnir isn’t the only hammer that requires courage to wield, after all. This device requires either four 21700 or 20700 batteries to operate. (Batteries Not Included) Please note: Mechanical mods are for advanced users and we would suggest having a full understanding of how this product works before purchasing.