AWithZ UF20B – 10.5KW Capacitor Battery Spot Welder | 3-in-1 Auto / Manual / Foot Pedal

The AWithZ UF20B is a high-power capacitor-based battery spot welder built specifically for DIY lithium battery pack assembly, repair, and production work. At 10.5KW peak welding power, it delivers strong, consistent weld penetration on nickel strips across 18650, LiFePO4, and other cylindrical lithium cell formats — the kind of clean, reliable weld that holds up under the mechanical and thermal stress of real-world battery use.

Capacitor-Based Welding — Why It Matters

Unlike transformer-based spot welders that draw power directly from the mains during each weld pulse, the UF20B stores energy in capacitors and releases it in a precise, controlled burst. This capacitor discharge method produces a faster, more concentrated weld pulse with lower heat spread into the cell body — reducing the risk of heat damage to sensitive battery cells during welding. The result is a stronger weld joint with less thermal stress on the cell, which is critical when building high-quality battery packs intended for drones, electric vehicles, power tools, and energy storage systems.

3-in-1 Welding Modes

The UF20B supports three independent operating modes, giving users full flexibility for different workflows and project types:

• Auto Mode — The welder fires automatically when the welding probes make contact with the workpiece. Ideal for high-volume, repetitive welding where speed and consistency matter.
• Manual Mode — The weld is triggered by a button press, giving the operator full control over timing. Better for precise, one-at-a-time placements on complex cell configurations.
• Foot Pedal Mode — Hands-free trigger operation via the included foot pedal. Both hands stay on the workpiece for accurate probe placement while the foot controls the weld — the preferred mode for professional and workshop environments.

Having all three modes in a single unit means the UF20B adapts to how you work, rather than forcing a single workflow.

Built for 18650 and LiFePO4 Battery Packs

The UF20B is optimised for the nickel strip welding process used in lithium battery pack construction. Whether you are assembling 18650 cell packs for e-bikes and drones, building LiFePO4 packs for solar storage, or repairing existing battery modules, the UF20B’s welding output is tuned to produce clean penetration through standard pure nickel and nickel-plated steel strips without burning through thin material or leaving cold welds.

Practical Design for Workshop Use

The UF20B is designed with a practical, no-nonsense layout suited to bench and workshop environments. The included foot pedal ships in the box — no additional accessories required to use foot pedal mode. The unit is ready to weld straight out of the box for users familiar with spot welding safety practices.

Who Is the UF20B For?

• DIY battery pack builders assembling 18650 or LiFePO4 packs for personal projects
• FPV drone builders constructing custom Li-ion packs for long-range builds
• EV and e-bike enthusiasts building or rebuilding battery modules
• Solar and energy storage builders assembling LiFePO4 packs
• Repair technicians replacing cells in laptop, power tool, and e-scooter battery packs
• Small-batch workshop production needing reliable, repeatable welds at volume

Package Includes

• 1× AWithZ UF20B Capacitor Spot Welder (10.5KW)
• 1× Foot Pedal
• Welding probes / cables

⚠️ Always use appropriate eye protection and work in a ventilated area when spot welding. Ensure cells are at safe charge levels before welding. This is a high-power tool — follow all safety guidelines included in the manual.