Battery Spot Welder 11 Gear Adjustable Automatic and Manual Modes Handheld Spot Welding Machine Battery Spot Welding Machine for 18650 Battery Welding Nickel Sheets. Feature: Replaceable Welding Needles, Clear LED Display, Compact and Portable, 11 Adjustable Power Levels, Safety Features. Specification: Origin Mainland China, Battery capacity 3000mah, Output voltage 4.2V, Output current 800A MAX, Applicable nickel sheet thickness 0.1-0.25mm, Shell material ABS, Product size about 196.00x41.00x25.00mm.