18650 battery spot welder Sunkko 709A, up to 800A and 1.9kW
Brand: Sunkko
VAT included (Ex VAT: 158.24 €)
The 18650 battery spot welder Sunkko 709A is an advanced tool designed for precise spot welding of metal strips that connect batteries such as 18650 and 2170, among others similar. It is perfect for repairing and building battery packs used in laptops, power banks, electric vacuum cleaners, drills, power tools and electric car batteries.
This pulse welder offers microprocessor control with adjustable welding current up to 800A, capable of welding sheets from 0.1 to 0.2 mm thick. It also integrates an adjustable battery charger from 4.2 to 36V and 0-3A, allowing batteries to be tested and charged during the process.
Key features
- Microcomputer control for double-pulse spot welding and built-in charger.
- Precision adjustment with control up to level 199, allowing exact welds.
- Selection of one or two pulses to suit different materials and thicknesses.
- Quick adjustment button for series of up to 16 pulses, ideal for thicker materials.
- Adjustable charger between 4.2 and 36 V with current adjustable up to 3 A.
- Foot switch and pressure adjustment to improve precision and comfort when welding.
- LED light under the welding points to improve visibility and precision.
Technical specifications
- Input voltage: CA 220 V
- Primary current: 2-15 A
- Welding current: 50 - 800 A (pulse time 1 ms - 19 ms)
- Charger output voltage: 4.2 - 36 V (adjustable)
- Charger output current: 0-3 A (adjustable)
- Dimensions: 140 x 245 x 200 mm
- Weight: 4.3 kg
- Sheet thickness for welding: 0.1 - 0.2 mm
Typical uses
This machine is ideal for technicians and hobbyists working with rechargeable batteries, allowing the repair and creation of 18650 and 2170 battery packs. It is useful for:
- Repairing laptop batteries and power banks.
- Welding batteries for power tools and vacuum cleaners.
- Building custom battery packs for electrical projects or electric vehicles.
Compatibility and recommendations
Compatible with cylindrical 18650, 2170 and similar batteries. It is recommended to connect the machine to an electrical installation with an RCD and earth of at least 40A to avoid tripping due to the high instantaneous current draw.
This welder is a complete solution for professional and hobby work that requires precision, power and versatility in spot welding and battery charging.
- Microcontroller for pulse welding up to 800A
- Precise welding of metal strips from 0.1 to 0.2 mm
- Built-in adjustable charger from 4.2 to 36 V and 0-3 A
- LED light to improve precision at the weld points
- Foot switch and pressure adjustment for greater control
- Input voltage: 220 V AC, primary current 2-15 A
- Compact dimensions: 140 x 245 x 200 mm, weight 4.3 kg
Customer Questions & Answers
What materials and sheet thicknesses are compatible with this spot welding machine?
The machine is designed to weld nickel strips with thicknesses between 0.1 mm and 0.2 mm, typical in 18650, 2170 and similar cells. Use outside this range may produce poor welds or damage the machine. It is not optimised for metals other than nickel without prior testing.
What are the electrical specifications and power requirements for safe operation?
The equipment requires 220 V AC mains power and operates with a primary current of 2 to 15 A. The welding current ranges from 50 to 800 A via adjustable pulses lasting between 1 ms and 19 ms. It is important to have a stable electrical supply and proper earthing to avoid damage or electrical hazards.
How is it installed and what is included in the box?
The box includes the main machine, welding cables, electrodes, foot switch and manual. Installation requires connecting the unit to a 220 V socket, fitting the electrodes and checking that all connectors are securely attached. No additional tools are required apart from minor adjustments; it is advisable to ventilate the area to dissipate heat.
What operating limits or common issues can arise when welding battery packs?
The main limitation is that thicker strips above 0.2 mm may not weld securely. Overload from continuous use can trigger thermal protection and force cooling pauses. A worn electrode or poor contact produces weak welds; it is essential to keep them clean and check pressure settings.
What are the differences compared with other spot welders with internal batteries or lower-amperage models?
This model reaches up to 800 A and 1.9 kW, allowing faster and more reliable welding of thicker materials compared with portable battery-powered welders, which are usually limited to 200–500 A. However, because it requires 220 V and is larger, it is less portable and less versatile than integrated battery solutions. The choice depends on workload and the type of batteries targeted.
What types of batteries is this welding machine suitable for?
It is suitable for cylindrical batteries such as 18650, 2170 and similar ones used in laptops, power banks, power tools and electric vehicles.
What maximum welding current does the Sunkko 709A support?
It supports up to 800 amperes of welding current, with pulse time adjustable between 1 and 19 milliseconds.
Does the machine include a battery charger?
Yes, it includes a built-in charger with adjustable output between 4.2 and 36 V and current from 0 to 3 A for testing and charging batteries.
What electrical precautions should I take when using this welder?
It is recommended to connect the machine to an installation with an RCD and earth of at least 40 amperes to avoid the breaker tripping due to the high instantaneous power draw.
Can I use this machine to build my own battery packs?
Yes, it is ideal for creating and repairing custom battery packs with 18650, 2170 and similar batteries.
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