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Spot Welder, Kerpu Mini Spot Welder, Portable Spot Welder Machine, Spot Welding Equipment Energy Storage 5000mAh for DIY 18650 Battery, Portable Battery Welder with Type-C Port (Black)

Free shipping on orders over $29.99

$51.99

$ 26 .99 $26.99

In Stock

1.Color:Black


About this item

  • Adjustable 11 gears, more accurate welding and more stability welding. Automatic and manual mode adjustable, easy to operate.
  • The welding pen is comfortable to use, the length of welding pen is 40cm/16 inches, that makes operation more flexible. It is low resistance oxygen free copper material, welding stability.
  • Suitable for 18650 and other cylindrical lithium batteries, nickel metal hydride batteries, cadmium nickel batteries can be welded firmly. It can be also used to weld iron, steel, stainless steel sheets with the thickness less than 0.2 mm/ 0.007 inch to other iron, steel, stainless steel materials. With it, save your time and effort.
  • Our portable spot welders own perfect over-charge, over-discharge, over-temperature etc protection functions and double protection performance.Unique overheating protection device automatically cuts off power when the overheating occurs.
  • 【Our service】In the process of using the spot welder, please feel free to contact us if you have any questions. We will replace or refund for you to ensure that you can have a pleasant shopping experience.



Product Description

spot welder 18650

When you receive the product, the spot welder has a low battery, so please charge it and use it.

The following are suggestions we give you during the operation.

  • Don’t press hard!!! It’s a resistance welder. And pressing hard will give you a weak weld.
  • When the spot welding machine shows that it cannot be charged, please be patient for more than 30 minutes to reactivate the charging function of the spot welding machine.
  • . In the process of using, you don't need to use too much strength, just a little bit.
  • .Regarding the use of equipment, ensure sufficient power when using, and there will be better spot welding effect.
  • .Check whether the soldering pen is in good contact, and whether the contacted head is sunken.
  • .The most important thing is that you need to practice more, because you are not familiar with the product after receiving it.I
  • f you operate it a few times, you will find that this product is really worth owning.

Why does a spot welding pen produce sparks?

  1. When our spot welding pen is used multiple times, there will be black oxide on the surface, which will come into contact with the nickel sheet, causing the oxide to react and causing sparks.
  2. When our gear is too high, there will be sparks when the output current is too high.
  3. When the spot welding pen is not in contact with metal, there will also be a large amount of sparks.
  4. When the spot welding pen comes into contact with the nickel sheet, but the nickel sheet and battery are not fully in contact, a large amount of sparks will also be generated at the tip of the spot welding pen, resulting in poor spot welding effect.

So when we operate, please wear protective measures such as glasses. Normal operation will not generate a large amount of sparks.

welding 18650

DIY 18650/26650/36650 and other cylindrical batteries

DIY batteries, repair our electronic devices, reuse electronic devices that have been damaged due to battery damage, save money, and also protect the environment.

Spot welding of mobile phone batteries

Nickel chip conversion for mobile phone batteries.

Our phone has been in use for a long time and the battery is no longer durable. To replace the battery, we can use our spot welding machine to replace the nickel plate on the phone.

Soldering nickel sheets to circuit boards

Welding between nickel sheets and circuit boards

Our spot welding machine can weld materials such as nickel sheets and nickel sheets, nickel sheets and iron, nickel sheets and circuit boards.

High capacity battery

5000mAh high capacity

5000 mAh high capacity battery, Type-C input port, with a parameter input of 5V/2A, can be fully charged in up to 2 and a half hours.

the maximum output current can reach 650A.

spot welder pen

16 Inches spot welder pen

The 16 inch spot welding pen, paired with our side opening, is very flexible and convenient to operate.

temperature control protection

Temperature control protection

The spot welding machine is equipped with a built-in temperature control probe. When the battery temperature reaches 60°C /140 ℉, the spot welding machine automatically shuts down.

The spot welder automatically shuts down without any operation within 8 minutes.

light
Spot welder accessories

Philip J. Balcar
2025-07-26 14:40:09
I recently used a battery spot welder, and overall, it’s been excellent! The initial instructions were a bit confusing, but with a few helpful YouTube videos, I quickly got the hang of it.I used this spot welder to replace batteries that had a coating making it impossible to solder to the sides. The spot welder worked perfectly for this task, allowing me to make strong, clean welds with ease.Once I figured out how to use it, the performance was fantastic. It made the battery replacement process much smoother and more efficient than soldering.Overall, I’d give this battery spot welder five stars. With a bit of guidance from online resources, it’s a reliable tool that gets the job done effectively.
Acr
2025-06-04 20:16:10
Works perfectly. It’s a little tricky to hold the probs and the hit the weld button. But it does have an automatic mode. Once you get used to it.
Allan Winning
2025-05-23 11:01:43
This product is really handy and definitely value for money, you just need to be aware that it won't do thick nickel strip. Works well about 0.15mm and you would be pushing to do 0.18mm. I also give it a rest now and then as the leads get quite warm. I will normally do about 30 spot welds and then have a break for 5-10mins before going again.
Toolman
2025-05-06 21:26:36
I bought this a few years ago back when it had 6 "gears". It worked ok back then but was underpowered. I think I used it a total of 2 times back then. I went to go use it again and it now no longer has enough power to weld even the thinnest nickel strips. now I have to buy another one that is more powerful and not cheap garbage. This isn't even high enough quality for a hobbyist that uses it every once in a while, because now 3 years later it is completely useless... it is complete trash that will just disappoint you over and over again. you know what they say, you get what you pay for.Also important to note: It will NOT weld pure nickel strips at all, the only thin I have been able to weld with it is the fake "nickel" strips that come with the welder. I bought separately some 0.1x8mm nickel strips (the thinnest kind that even the weakest welders should be able to weld) and it can't weld them unless you hit the same spot 3 times.
Shawn C.
2025-04-19 13:36:38
I read other people's reviews and I was a little scared. But, I bought it anyway. I love it! It has worked great for me. I have been using .1mm nickel strips on setting 3, for 18650 batteries, and it works great. I have not used the thicker .2mm strips that were supplied with the unit. I thought there would be a loud "pop" like I was TIG welding or something. Nope. Very small flash and a small puff of smoke. This is great for hobbyists like myself that don't like to see electronics (laptop batteries, handheld radios, vape pens, etc.) go to waste because of dead batteries. If you have a need for a light duty spot welder, I recommend this one!
Ryan
2025-04-09 15:27:54
The battery won't last for larger packs and a pack with around 140 cells required multiple charge cycles. After welding 5 or 6 times the electrodes become too hot to comfortably hold and by 10 to 15 it starts to burn without gloves. Great to start learning to spot weld but for a larger pack it really hurts more than the money you save for going cheap
Rosette Nguyen
2025-03-31 14:59:39
I did not know a battery powered spot welder exist until I saw it on Youtube. I was not very convince, but decided to purchase it for my cordless vacuum battery replacement. Thanks to Youtube for showing how it works, I get an idea how it works. However, the first time is somewhat startling when it made the spark. After a few tries, I got a hang of it. The welder made 2 welds (one at each contact points). Surprisingly, the weld is sturdy. I pull the batteries apart but could not. I finish my batteries replacement in less than half hours with this tool. The welder battery level still indicate full charge.Overall, it is a great tool for DYI project involving battery replacement. I am glad I saw it on Youtube and purchase it. It was worth the investment.
Arturo Graniel
2025-03-18 12:23:10
Vista excelente. Funcionó perfectamente 👍
Dean
2025-02-15 21:43:49
Would not weld even on highest setting and using the nickel strip supplied with welder. I even tested with my own 100% nickel strip and would not weld. I should have taken note of the online reviews I read first. Save your money.
D Paul A
2024-12-31 12:53:17
It works really well with the roll of metal that comes with the kit but doesn't have the power to spot weld anything thicker.
Robin L
2024-12-17 20:26:32
If youve never built a Li-Ion battery pack before, then this little welder will be super helpful.To easily strap your batteries together, get this handy little unit. Works like a charm.
Cliente de
2024-12-03 12:00:48
Buen producto , compacto y de gran calidad
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