Capacitor Battery Spot Welder
- 10KW maximum pulse power, 10.5KW in title
- 99 adjustable gears
- Auto, manual and foot pedal modes
- 100-240V input, 15 amp adapter, ready in 5 minutes
- Pen length 40cm, replaceable tip
- Must run on wall power while welding
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A capacitor spot welder with three modes for battery pack work. The capacitors hold very little charge, so it only works while plugged in.
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ASIN: B0DP98RLCQModel: UF20BCategory: Spot Welding Equipment
Overview
A workbench used for building lithium packs is where this rounded aluminum alloy welder belongs, with a removable pen for replacing tips. It offers automatic, manual and foot pedal modes.
The strength is mode choice: three ways to trigger a weld on one machine, from a pen switch to a pedal to automatic firing. The big limit is power, since the capacitors drain within a minute or two and the unit must stay connected to the wall while in use.
Who it's for
Battery pack hobbyists who weld nickel strip on cylindrical cells will use the manual button and pedal modes. A mobile user without wall power cannot run it for long.
Pros and cons
- Three trigger modes
- Rounded aluminum alloy shell
- Removable pen with replaceable tip
- Nickel sheet and foot pedal included
- Must stay plugged in while welding
- Power figure stated two ways
- Thin material limits per gear unclear
Performance notes
Capacitors release a short pulse when triggered by the pen button, the pedal or automatically, and the gear number sets pulse strength. Because they hold little charge, the welder must charge from the wall as it works. The pen length matters: the listing says a longer pen would reduce output current.
Specifications
| Brand | AWithZ |
|---|---|
| Model | UF20B |
| Dimensions & fit | |
| Pen length | 40cm |
| Power & efficiency | |
| Maximum pulse power | 10KW (10.5KW in title) |
| Input voltage | 100-240V, 15 amp adapter |
| Battery types | 18650, 14500, 21700, LiFePO4 |
| Included components | |
| Included Components | Spot welder, charger cable, foot pedal, pair of pens, 2-meter nickel plated sheet, file, manual |
| Other details | |
| Adjustable gears | 99 |
| Time to weld-ready | Within 5 minutes |
| Welding | Automatic, manual and foot pedal |
| Foot pedal cable | 2m long |
| Housing | Aluminum alloy, flame-retardant |
Closest rivals on specs
GLITTER 801D Battery Spot Welder- Item Weight 4.02 vs 8.4 pounds (-52%)
VEVOR Portable Spot Welder- Item Weight 4.02 vs 26.5 pounds (-85%)
Frequently asked questions
Can the AWithZ UF20B run without being plugged in?
No. The listing says to use it connected to wall power and charging while in use, because the capacitors store little and are consumed within a minute or two.
What is in the UF20B package?
A spot welding machine, a charger cable, a 2m foot pedal, a pair of pens, a 2-meter roll of nickel plated sheet, a file and a manual.
How do the three modes work?
Automatic mode outputs after you set the gear, manual mode outputs once when you press the pen button, and foot pedal mode outputs once per step.
How long is the spot welding pen?
40cm, which the listing says gives the best spot welding effect.