SEQURE SQ-SW3 Spot Welder (SWP25 + WP30 EU Plug)

The SEQURE SQ-SW3 is a portable capacitor-storage spot welder designed for FPV pilots and drone builders constructing custom 18650 or 21700 Li-ion packs for long-range cruising and cinelifter rigs. This complete kit includes both the SWP25 split welding pens and the WP30 integrated welding handle, plus EU-plug chargers, allowing immediate bench use without requiring a separate high-discharge donor battery.

Key features

• Supercapacitor energy storage and low-resistance MOSFETs deliver up to 2500A of welding current.
• Welds nickel-plated strip up to 0.5mm, pure nickel up to 0.3mm and copper sheet up to 0.2mm for secure, low-resistance battery assembly.
• 1.8-inch colour TFT display provides real-time readouts of input voltage, temperature, and weld parameters.
• Fully adjustable pulse duration and pulse count to dial in exact weld penetration for different nickel thicknesses.
• Selectable auto and manual trigger modes with an adjustable trigger delay of 0.5 to 3 seconds.
• Built-in low-voltage warning and over-temperature safety protections.

Specifications

• Model: SQ-SW3 (capacitor energy storage)
• Maximum output: 5.6V, 2500A
• Weldable thickness: nickel-plated strip up to 0.5mm, pure nickel up to 0.3mm, copper sheet up to 0.2mm
• Charging inputs: XT60 (5.6V 15A max), USB-C PD3.0 (25V max), DC5525 (25V max, battery up to 6S)
• Display: 1.8-inch colour TFT
• Welding handles: 2 x SWP25 split pens, 1 x WP30 integrated handle
• Foot pedal port: 3.5mm
• Dimensions: 223 x 133 x 68mm
• Weight: 1565g
• In the box: SQ-SW3 welder, 5.6V 15A charger, 19V 2A charger (EU plug), USB cable, 18650 battery fixture, 5m of 0.1 x 8mm pure nickel strip, file, 2 x SWP25 split handles, foot pedal, WP30 integrated handle, 2 x 500mm 25 sq mm copper cables, 4 x 3 x 35mm welding pins, audio cable, screwdrivers, wrenches and spare screws

Away from mains power, the welder can be recharged from a LiPo pack of up to 6S through its DC5525 input, or from a USB-C PD supply.