Longyun electric wrench lithium battery 300 torque 15 battery is a 3.7 volt battery. According to relevant public information, electric wrenches are mainly used in steel structure installation industry. They are specially used for installing high-strength bolts of steel structures. High-strength bolts are used to connect steel structure contacts, usually in the form of bolt groups. The lithium battery torque of Longyun electric wrench is 15, and the battery core is a 3.7V battery.