Portable Spot Welding Machine is mainly used in the welding of nickel sheet of cylindrical battery like 1-8650, fire-proof and anti-fall.Self-carried with a charging control module, which charges the battery through the USB port. Equipped with charging indicating lamp, red while charging and green for fully charged. You can have a try.Handheld Welding Machine is precisely controlled by the single-chip microcomputer program without trigger the switch.Free your hands or foot pedals completely.This spot-welder can welding hundreds of welding points on commonly used nickel-plated sheets within 0.1mm-0.15mm if fully charged.Item Type: Spot Welding Machine SetCharging Input Port: -USBCharging Time: About 4HOutput Voltage: 4.2V(max)Output Current: 639A(max) Current: 300ADesign current: 1200A(max)Battery Capacity: 2Pcs x 4300mAh Rechargeable Batteries(built in)Input: 5V 1AWelding Thickness: About 0.1-0.12mmColour: blackMaterial: pvc+ metalSize: 10 x 8.4 x 2.8cmPackage Contents:1 * Spot Welder2 * Soldering pen1 * Charging cableOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.