Kerpu Battery Pack Spot Welder Kit Review – Pros & Cons – Battery Spot Welder

The Kerpu Battery Pack Spot Welder Kit is a pocket-sized powerhouse, a titan in a tiny frame. Its compact form belies its incredible capability, for it wields the power to fuse metal with pinpoint precision. This machine is a master craftsman, and its 11-gear adjustable power settings are its versatile tools, allowing you to tailor the welding intensity with meticulous care. Whether you are working on delicate projects or robust battery packs, this spot welder will perform with unwavering consistency. It is equipped with a formidable 5000mAh rechargeable battery, and it holds a charge like a steadfast promise, ready to tackle your projects for extended periods without faltering. The kit also includes a generous 2M nickel sheet and four 4×4 battery holders, providing you with everything you need to begin your journey into the world of battery pack creation. Thus, this Kerpu Battery Pack Spot Welder Kit is not merely a tool, but an entire workshop in the palm of your hand.

Furthermore, this Kerpu Battery Pack Spot Welder Kit is designed for seamless operation, making it a dream for both seasoned professionals and curious novices. Its intuitive interface is as clear as a mountain spring, and it guides you through the process with effortless ease. The small sentences ensure that every step is a breeze, preventing any confusion or missteps. The machine’s rapid response time is like a flash of lightning, delivering a swift and secure weld in an instant. Subsequently, the included accessories are thoughtfully curated, and they serve as the perfect companions to the main unit, allowing you to build intricate battery configurations with remarkable dexterity. Consequently, the included nickel sheet is a blank canvas, and the battery holders are the perfect molds, and together they enable you to construct custom battery packs for a wide array of applications. Therefore, this Kerpu Battery Pack Spot Welder Kit transcends the ordinary, offering a truly comprehensive and user-friendly experience.

Ultimately, the Kerpu Battery Pack Spot Welder Kit is an investment in limitless creativity and functional power. It empowers you to bring your projects to life, and it gives you the ability to mend, build, and innovate. The device itself is as dependable as an old friend, and its consistent performance is a testament to its superior engineering. After all, it is the heart of a maker’s toolkit, and it beats with the rhythm of innovation. In conclusion, this spot welder is a small key that unlocks big possibilities, and it opens the door to a world where broken electronics can be fixed, and new inventions can be powered. This is more than just a tool; it is a catalyst for creation, and it’s a testament to the fact that great power can indeed come in small packages.

FEATURES:
– Pocket-sized design
– 11 gears adjustable power
– 5000mAh rechargeable battery
– Includes 2M nickel sheet
– Comes with 4X4 battery holder
– Used for making battery packs
– Kerpu brand
– Suitable for 18650 batteries
– Portable spot welder machine
– High capacity battery

The Kerpu 18650 Spot Welder is a pocket-sized, portable machine designed for making battery packs. It features 11 adjustable power gears and is powered by a high-capacity, 5000mAh rechargeable battery. The package includes a 2M nickel sheet and a 4×4 battery holder, making it suitable for welding 18650 batteries.

PROS:
– Welds great
– Works as it should
– Works really good
– Good value for light-duty
– Works for amateur use
– Works as long as it’s plugged in
– Very easy to use
– Lightweight and portable
– Includes everything needed
– Can be used as a power bank
– Has a safety controller

CONS:
– Welding leads are too short.
– Leads crimped, can’t replace tips.
– Low power for thicker metals.
– Only for occasional, light use.
– Weak and small welds

The Kerpu 18650 Spot Welder is a lightweight, portable, and easy-to-use tool with an 11-gear adjustable power setting and a 5000mAh rechargeable battery that can also function as a power bank. It is suitable for amateur, light-duty, and occasional use, and works well for making battery packs, though some users note that its low power is not ideal for thicker metals and may produce weak, small welds. The device includes everything needed to get started, such as a 2M nickel sheet and 4×4 battery holder, and has a safety controller, but its welding leads are too short and cannot have their tips replaced since they are crimped. It works best when plugged in, providing good value despite its limitations. Read more…







Portable Mini Power Bank for Kerpu Pocket Welder

Portable Mini Power Bank for Kerpu Pocket Welder

This image shows a 5000mAh mini power bank. It is portable and compact. It can support charging for your smartphone. It has a Type-C charging port. The device takes 3 hours to be fully charged. The input is 5V/2A. This power bank is suitable for powering the Kerpu Pocket Welder for 18650 batteries.



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Best Kerpu Battery Pack Spot Welder Kit Deals

Kerpu Battery Spot Welder, 2'' LCD Screen 5000mAh 18650 Spot Welder Pocket Size Upgraded Enhanced 199 Gears Adjustable Portable Mini Spot Welder with Nickel Sheet For Making Battery Packs

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Key Features

  • ✅ Pocket-sized mini spot welder: Kerpu mini-size battery spot welder CP02. only half the size of other spot welders, easy to carry. designed for welding nickel strips of cylindrical batteries, NI-MH batteries,18650 nickel-cadmium batteries, etc. built-in 5000mAh rechargeable batteries, you can spot welding your battery anywhere anytime.package included complete accessories, it's a great gift idea for fathers, husbands, male friends, and DIY enthusiasts.
  • ✅ Supports more precise spot welding mode settings: We have optimized and upgraded the product. the battery spot welder support 199 gears adjustment, support automatic modes. making it easy to make battery packs (support welding thickness of less than 0.2mm of iron, steel, and stainless steel sheets). use the equipped power cord to quickly charge the device, and maintain the battery level at 50% every time, to achieve the best welding effect.
  • ✅ Multi-battery application tool: Unlike other plastic shells, our product is made of aluminum alloy, surface anodized, fire-resistant, and drop-resistant.the 2-inch LED display, is very easy to identify the gear adjustment changes, charging status, and battery level changes. easy-to-spot welding cylindrical batteries, NI-MH batteries, and 18650 nickel-cadmium batteries. Note: Do not use too thick nickel foil (such as a thickness than 0.2mm).
  • ✅ Pay attention to the details of the product and the safety of use: CP01 is built in a 5000mAh rechargeable battery, and our product has passed overcharge protection, safety temperature control protection, load detection, and short circuit detection to protect your safety. In addition, when the product temperature exceeds 60 degrees, the device will pause to avoid battery damage and fire.
  • ✅ Equipped with 2M nickel strips: The package includes 1x 5000mAh pocket-sized battery spot welding machine, 2x spot welding pens (line length 30CM + pen head 9CM), 2M nickel-plated foil (L=2m, W=0.9cm, Thickness=0.1mm), 1x Metal file, 1x 1M USB to Type-c charging cable. If you have any questions, please feel free to contact us. Your good experience is important to us!

Product Details

Brand:Kerpu
Model:CP02
Color:Black

Spot Welder Control Board, High Output Battery Spot Welder, Battery Welder PCB Circuit Board 6 Gear Adjustable, Spot Welder for Lithium Batteries, Control Board Kit Spot Welder 100-900A (‎02B-DLB)

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Key Features

  • ✅ Safe to use: The spot welding board requires a self-contained power supply. You can use your own bike battery or other batteries to connect to our circuit board. The battery spot welding machine has a powerful output power, with 6 adjustable gears, and can weld materials of 0.02mm or even 0.03mm. Welding is more accurate, and thousands of points can be continuously welded onto nickel plates.
  • ✅ Widely used: Spot welding plates can be used for spot welding of lithium cylindrical batteries and nickel hydrogen batteries such as 14650, 17490, 18650, 21700, 26650, and 32650. You can also repair electronic devices with batteries, such as handheld drills, electric toy cars, electric toothbrushes, electric facial washers, and so on, saving you a lot of expenses.
  • ✅ Power selection: Spot Welding Machine Lithium Battery Control Board needs its own power supply, supporting 6.5V-16V power supply, battery discharge current <900A, short circuit current <1800A, beyond the above range may damage the control board.
  • ✅ Safe use: After connecting to the power supply, it will intelligently match and determine whether the power supply can work to prevent damage to the circuit board. The operation is simple. There is a multiplier and battery capacity to choose from. It can be determined whether the battery is low-power or high-power.
  • ✅ Rich accessories: We have equipped the power supply positive and negative poles with connecting wires, screws, spot welding pens, 2-meter nickel plated plates. You can practice more on discarded batteries, familiarize yourself with the power level of each gear, and then operate your equipment in practice. This is to prevent damage to your battery. The accessories are complete, and after receiving the goods, you only need the power to operate immediately.

Product Details

Brand:Kerpu
Model:‎02B-DLB

5000W Mini Battery Spot Welder, Portable Spot Welder Machine DIY Kit for 18650 Battery Pack Welding Tools, Adjustable Battery Welding Soldering Machine with Nickel Strip and Spot Welding Pen

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Key Features

  • ✅ ✔ LCD Screen Display: Designed with LCD digital display, you can directly see the battery level and charge this machine in time. ( Please fully charge it before first use, and recharge it when the voltage is below 7.3V)
  • ✅ ✔ Durable Material: Agoal spot welder has good performance and long service life with ABS housing, two spot welding pens of good conductivity and low contact resistance. The tip is replaceable
  • ✅ ✔ Wide Application: 5000w spot welder is adjustable in output current, spot welding 0.1-0.15mm nickel plated steel sheet and 0.1mm pure nickel sheet, great for welding 18650 battery packs and iron/ stainless steel sheets
  • ✅ ✔ Easy to Operate: Just press the nickel belt with two soldering pens and step on the foot switch, wait for about 0.5 seconds for output spot welding, and then release the foot switch
  • ✅ ✔ Compact Size: Lightweight with 6.5*3.86*2.36 inch body, you can take this machine in different occasions. If you have any questions within 60 days, you will get a replacement

Product Details

Brand:AGOAL
Model:AGOAL20230601
Size:6.5 X 3.9 Inches
Dimensions:6.5 X 2.36 X 3.86 inches

Spot Welder, Docreate Battery Spot Welder, Handheld Spot Welder, 10-position Output Power Adjustment, 5000W Portable Mini Spot Welder DIY Kit for Welding 18650/ and Nickel

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Key Features

  • ✅ Hight Quality & Durable: The 5000W High power spot welding machine is good performance and long service life. Which is ABS shell material, surface anodizing technology, anti-abrasive and safe to use. The spot welding machine is come with welding pen with good conductivity and low contact resistance.
  • ✅ Portable Design:This mini spot welder equipment is Portable and lightweight, space-saving in home, and you can transport your spot welder to different job locations easily and quickly.
  • ✅ Material Is Durable: The adjustable spot welder can weld thousands of points continuously on nickel sheet after full charge,the solder pins of the adjustable spot welding machine can be removed and replaced, easy installation and operation.
  • ✅ Easy to Operate: The DIY battery spot welder machine is foot switch controls welding, spot welding is more arbitrary. Just press the nickel belt with two soldering pens and step on the foot switch. Wait for about 0.5 seconds for output spot welding,then release the foot switch.suitable for precise welding.
  • ✅ Wide Application & Warranty: The spot welder with large output power can be used to connect nickel strips of 18650 lithium battery, or spot welding iron sheets, stainless steel sheets. And it is also suitable for welding 0.1-0.15mm nickel plated steel sheet and 0.1mm pure nickel sheet quickly. In the process of using the spot welder, please feel free to contact us if you have any quest

Product Details

Brand:Docreate
Model:spot welder-03
Color:5000w Spot Welder, Blue

AWithZ 9000W Battery Spot Welder, Rotary Knob Operation 100 Gears Adjustable Foot Pedal Operated, 0.1-0.3mm Spot Welder with Dual Pulse Output, Portable Spot Welder for Making DIY Battery Packs (UK1)

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Key Features

  • ✅ Two types of Trigger Flexibility & Safety: Seamlessly switch between hands-free foot pedal operation and precise hand control (Trigger) for versatile workflows and enhanced safety when handling sensitive batteries.
  • ✅ Intelligent Thermal Protection: Built-in safety monitors battery temperature (Cont), automatically halting welding (Trigger disable) and alerting you if overheating is detected, preventing damage. If there is no operation for 8 minutes, the spot welder will automatically shut down.
  • ✅ Ultra-Low Power Consumption: Engineered for exceptional energy efficiency , significantly extending standby time between uses and reducing operational costs. Precision 100-Level Power Control: Fine-tune welding strength for delicate tasks (like phone/bluetooth batteries) or robust jobs (cylindrical power cells) with our intuitive rotary knob.
  • ✅ Multi-Mode Welding for Diverse Batteries: Expertly weld cylindrical power batteries, mobile phone batteries, and Bluetooth batteries (Mode) with tailored settings accessible via the clear control panel.
  • ✅ Simple Rotary Knob Operation & Clear Interface: Effortlessly adjust settings (Gear, Trigger Time, Mode, Number of continuous spot welds) using the large rotary knob and clearly labeled control panel for ultimate user-friendliness.

Product Details

Brand:AWithZ
Model:UK1

Capacitor Spot Welder, 10.5 kW Farad Battery Pack Welding Machine with Automatic & Foot Pedal Modes, 100–240 V Spot Welder for 18650/21700/LiFePO4 Battery Pack Assembly

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Key Features

  • ✅ 【Fast Start-Up & Wide Voltage Support】 Supports 100–240 V AC input. After plugging in, the internal capacitor charges in a few minutes and the display shows when the welder is ready, helping you keep an efficient workflow whether in a home workshop or small production line.
  • ✅ 【Farad Capacitor for Stable High Power Welding】 Built-in energy-storage capacitors deliver a controlled pulse output for consistent weld spots. Maximum pulse welding power up to 10.5 kW (up to 2000 A at 6 V) provides strong, stable welding performance for battery pack assembly. For best results, operate the welder while it remains connected to wall power.
  • ✅ 【Automatic & Foot Pedal Welding Modes】 Offers two practical welding methods. In Automatic Mode, the welder triggers when the welding pen contacts the workpiece. In Foot Pedal Mode, you position the pen first and then step on the pedal to fire the weld, allowing steadier control on precise welds. Simple operation suitable for both beginners and experienced users.
  • ✅ 【For Battery Packs & Multiple Metals】 Designed for assembling battery packs such as 18650, 14500, 21700, LiFePO4 and similar cells. Capable of spot welding thin sheets of copper (up to 0.15 mm), pure nickel (up to 0.25 mm), and steel / iron / nickel-plated sheet (up to 0.4 mm), when using appropriate power settings. Always wear protective gear such as safety goggles during operation.
  • ✅ 【Aluminum Alloy Housing & Complete Kit】 Rugged aluminum-alloy enclosure with smooth edges is resistant to wear and helps dissipate heat. The insulated welding pens include replaceable copper tips for reliable current delivery. Package includes: SK-10P spot welder unit, AC power cord, foot pedal, pair of welding pens, nickel strip roll, battery holders, nickel-plated plates, spare welding tips, fine-grit file and user manual—everything you need to start building battery packs.

Product Details

Brand:chufa
Model:GCUS-816SK10PB
Dimensions:8.07 X 7.28 X 5.12 inches

SEESII 10KW Battery Spot Welder: Cordless 10000mAh Spot Welding Equipment, Color LCD Display, 25 Adjustable Gears, Auto/Foot Pedal Control, for Battery Packs DIY & Repair

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Key Features

  • ✅ 【Upgraded Battery Spot Welder】Delivers a peak output power of 10KW; It enables solid welding for nickel-plated sheets under 0.3mm and pure nickel sheets under 0.15mm in thickness
  • ✅ 【10000mAh Rechargeable Battery】Built-in ultra-large capacity battery; According to official test data, it can support more than 300 welding times when fully charged and set to gear 25 (Note: For optimal performance, fully charge it to 100% before first use)
  • ✅ 【Multi-Scene Application】Perfect for battery assembly, maintenance and DIY projects; Great for DIY and repair of power tool, electric vehicle and drone battery packs, as well as thin metal welding (Note: Aluminum and copper are not recommended due to high welding difficulty)
  • ✅ 【Clear Parameter Display】Color screen displays real-time voltage and other parameters for easier operation (Note: Welding quality is closely tied to the voltage level; Higher voltage brings better welding performance and firmer welds; Please charge when below 7.3V)
  • ✅ 【Compact Design】Compact overall size with the longest side approx 6.5 inches, lightweight and portable; A powerful yet compact battery repair station

Product Details

Brand:Seesii
Model:SE-402
Color:Black
Dimensions:1 X 1 X 1 inches

SEESII Battery Spot Welder: Rechargeable Battery Welder with Visual Display, 3360W Max Power with 1-99 Gears, Copper Tips, Portable Spot Welder for Lithium Battery (DIY, Repairs, Outdoor Use)

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Key Features

  • ✅ Built-in Rechargeable Battery​: Say goodbye to tangled power cords—grab this spot welder and work anytime, anywhere; Note: For optimal performance, fully charge it to 100% before first use; If the product is left unused, please charge it monthly to preserve battery health
  • ✅ Strong Welding Capacity: With a maximum output power of 3360W, the mini spot welder stands out among handheld models; tested to weld nickel-plated sheets up to 0.2mm thick or pure nickel sheets up to 0.15mm thick (Welding quality closely links to battery charge level)
  • ✅ Visual Display Screen: An intuitive display greatly boosts convenience, letting you monitor the welding process, device temperature, and remaining battery at all times
  • ✅ Precise Gear Adjustment: With 99 fine-adjustment gears available, the spot welding equipment perfectly meets your diverse welding needs for different materials and thicknesses
  • ✅ Auto/Manual Dual Modes: Choose freely between auto welding and manual trigger welding based on your needs—adapts to various scenarios for greater convenience

Product Details

Brand:Seesii
Model:SE302
Color:Black

Battery Spot Welder, 11 Gear Adjustable Handheld Spot Welder with a Battery Tester for 0.1-0.25mm Nickel, Portable Machine for DIY 1865-0, Lithium Batteries(COLOR:Black)

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Key Features

  • ✅ Combo Offer – The battery spot welder and battery tester checker offers a portable, integrated solution for both battery welding and power level diagnostics; eliminates the need for separate tools
  • ✅ Integrated Handheld Design – Compact, lightweight, and designed for one-handed operation, mini spot welder features a built-in welding pen and power module; Perfect for home repairs, workshops, or field work
  • ✅ Built-in Rechargeable Battery with Fast Charging – The handheld spot welder’s internal 2200mAh High-Rate battery frees you from power cords, letting you weld anytime, anywhere; Type-C fast charging drastically reduces downtime, ensuring your spot welding projects stay on track
  • ✅ Dual-Pulse Professional Welding – Delivers strong, precise welds for 0.25mm nickel strips, 0.2mm steel/iron, and 0.15mm pure nickel. Perfect for 1865-0 battery packs, DIY projects, and repairs.
  • ✅ Triple Safety Protection – Features temperature sensors, safety algorithms, and quality chips to prevent overheating, short circuits, and overloading.

Product Details

Brand:Jeyntanc
Model:22427774
Color:Black
Dimensions:N/A X N/A X N/A in

14.6 KW Capacitor Battery Spot Welder, AWithZ Spot Welder, 2-in-1 Automatic & Foot Pedal Two Modes Battery Farad Welding Equipment for 18650/LiFePO4 Lithium Battery Pack Building (P20B)

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Key Features

  • ✅ 5 Minute Quick Start Spot Welder: We use a wide voltage input of 100-240V and an adapter of 15amp high current for fast charging Connect the spot welding machine to the power supply using our adapter, and quickly reach the spot welding mark within 5 minutes (the display screen shows OK for spot welding), which can be used anywhere in the world.
  • ✅ 2 IN 1Mode: Our spot welding machine has automatic mode and foot pedal mode. The automatic mode is adjusted to the appropriate gear, and the spot welding pen can be inserted to start working immediately. Foot pedal mode, It is so much easier to position the probes for your welds when you are using the foot pedal. It gives you ample time to get everything set perfect before welding. step on the foot pedal and the spot welding pen will output once, which is very convenient.
  • ✅ Wide Application Range: A well made, compact spot welder. Not only for battery pack work, such as cylindrical batteries such as 18650/14500/21700, but even LiFePO4 batteries, industrial batteries, etc. And it can also be used for spot welding of different materials, for example, such as 0.6mm nickel plated sheet, 0.6 stainless steel sheet, 0.6 iron sheet, 0.3 pure nickel sheet, 0.2 copper sheet, etc. There are 999 adjustable gears, with different gear requirements for different materials.
  • ✅ Professional Battery Spot Welder: Equipped with 2 built-in super energy storage capacitors, Ultra capacitors have many thoughts of cycle life, and the maximum pulse welding power can reach 14.6KW. It is a brand new MOS, with no interference to the circuit or tripping issues, stable and sustainable operation, making it the best choice for professionals and DIY enthusiasts.
  • ✅ Random Bending Spot welding Pen Lead: The lead is very soft and can be bent freely without dragging the spot welding machine. The lead wire is 60 centimeters long, very suitable for our operation. The lead pins can be disassembled and replaced, and we have paired them with 6 pairs of replacement pins. When using the high gear continuously, the temperature of the lead is close to our hand temperature, but it will not harm us.

Product Details

Brand:AWithZ
Model:P20B
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