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

Battery Spot Welder Kit, 7500mA-h 80 Adjustable Power Levels Mini Spot Welding Machine with LCD Color Screen

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Key Features

  • ✅ Enhanced Performance: Built with an upgraded 7500mA-h rechargeable battery, this mini spot welder features a power bank design and Type-C fast charging, reaching full charge within 3-5 hours. It can execute thousands of welds on a single charge and effectively welds 0.1-0.15mm nickel sheets (Note: Cannot weld nickel strips with thickness greater than or equal to 0.2mm thick).
  • ✅ Adjustable Precision: The spot welder Offers a wide range of 80 adjustable power levels, allowing users to fine-tune welding settings from 1-8 and 1.1-5.4-8.0 for different materials and thicknesses. Ideal for both beginners and professionals, If you are a novice, we recommend setting the delayed auto weld time to (1-5 seconds)
  • ✅ Clear LCD Display: Battery Spot Welder Equipped with a colorful LCD screen that provides real-time information on battery status, delay time, temperature, and gear level, ensuring you remain informed and can adjust settings easily during your welding projects.
  • ✅ Safety and Convenience: Integrated with an advanced chip for adaptive control and temperature monitoring, the DJYIYEW spot welder automatically shuts off when temperatures exceed 60°C/140°F to ensure user and equipment safety. Its compact design enhances portability, making it an excellent tool for various applications.
  • ✅ Versatile Use and Complete Kit: Perfect for welding nickel sheets and capable of handling cylindrical lithium batteries like 18650/21650, and nickel-metal hydride or cadmium batteries. The kit includes everything needed: 1 x spot welder, 4 x nickel strips, 4x4 battery holders, 2 x welding pens, 1 x metal file, a USB-C cable and 1 x Manual.

Product Details

Brand:DJYIYEW
Model:13097-3

Battery Spot Welder, 10000W Cordless Spot Welding Machine with LCD Display, 10-90 Adjustable Power, Foot Pedal Control, Portable Spot Welder for Battery Pack DIY, Nickel Strip Welding & Repair

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Key Features

  • ✅ POWERFUL 10000W CORDLESS SPOT WELDER: This high-performance battery spot welder delivers up to 10000W output, making it ideal for battery pack building, nickel strip welding, and DIY repair projects. Cordless design gives you total freedom—no messy cables, work anytime, anywhere
  • ✅ BUILT-IN RECHARGEABLE BATTERY: Equipped with a large-capacity rechargeable battery, this portable spot welding machine eliminates the need for external power. Perfect for mobile use in workshops or home projects. (Charge fully before first use for best performance)
  • ✅ PRECISE WELDING WITH ADJUSTABLE POWER: Features 10–90 adjustable power levels with dual pulse technology, allowing precise control for welding 0.1–0.25mm nickel strips and battery tabs. Suitable for both beginners and professionals
  • ✅ LCD DISPLAY & EASY OPERATION: The clear LCD display shows real-time voltage and working status, helping you monitor performance easily. With foot pedal control, welding becomes safer, faster, and more efficient—just press and weld
  • ✅ COMPACT, PORTABLE & WIDELY USED: Lightweight and compact design makes this spot welder kit easy to carry and store. Perfect for battery pack assembly, lithium battery repair, electronics, hardware welding, and DIY projects

Product Details

Brand:Docreate
Model:Spot Welder
Color:Black2

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/Button 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 Button 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

8000W Spot Welder,Handheld Spot Welder,Portable Spot Welder Machine DIY Kit,High Power Handheld Spot Welding Machine,with nickel strip and spot welding pen,for 18650 Battery Pack Welding Tools

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Key Features

  • ✅ 🚀【8000W Battery Spot Welder】:The upgraded spot welder with Dual Pulse Output, foot pedal welding mode which can easily weld 0.1-0.3mm thick nickel sheets, you can finish the welding work easily and efficiently, the welding spot is nice and elegant. Can be used for spot welding of batteries, hardware, and electronic components. Screen size is 2.5 X1 CM, Soldering pen Length is 350mm. Sot welder LXWXH 15X9.5X6 CM
  • ✅ 🔋【1-9 Level Knob Adjustment】: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.The mini spot welder with 9 Level output power adjustment design, you can adjust the output power 0-800A by turn the knob, the larger the value, the higher the output.
  • ✅ 🚀【Easy to Use】:The solder pins of the adjustable spot welding machine can be removed and replaced, easy installation and operation.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.
  • ✅ 💌【Warm Tips for Beginner】: LCD Screen Display,The battery voltage level is the key factor affecting the spot welding effect.Our spot welder screen can display the internal voltage of the product in real time,it is very convenient for you to check and charge in time.The product should be fully charged before first use, please charge when the voltage on the screen falls below 7.3V.
  • ✅ 📞【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:SKU930645-US
Color:8000w Spot Welder, Black

AWithZ 10000mAh Battery Spot Welder, Rotary Knob Operation 100 Gears Adjustable Foot Pedal Operated, 0.1-0.4mm Spot Welder with Dual Pulse Output, Portable Spot Welder for Making DIY Battery Packs

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Key Features

  • ✅ Three types of Trigger Flexibility & Safety: Automatic mode automatically outputs without the need for foot pedals or buttons on the spot welding pen. Seamlessly switch between hands-free foot pedal operation and precise hand control (Trigger) for versatile workflows and enhanced safety when handling sensitive batteries.
  • ✅ Multi-Mode Welding for Diverse Batteries: The battery has a large capacity of 10000mAh and can be spot welded over 300 times in the highest gear. Expertly weld cylindrical power batteries, mobile phone batteries, and Button batteries (Mode) with tailored settings accessible via the clear control panel.
  • ✅ 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/Button batteries) or robust jobs (cylindrical power cells) with our intuitive rotary knob.
  • ✅ 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.
  • ✅ 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:UK3

11000W Battery Spot Welder, Awgem 0.1-0.3mm Portable Spot Welder with Rotary Knob 100 Gears, Auto Modes, Dual-Pulse, for Lithium Battery Repair and Welding

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Key Features

  • ✅ Smart Side Port Layout: The charging port and welding pen port are placed on different sides - no tangled cables and no blocked screen. The display clearly shows all parameters: automatic welding mode, trigger time (0 - 5s), power level (0 - 100), and continuous welding count (single or double pulse). Keep your workspace tidy, all parameters clear, and every operation effortless
  • ✅ 11000W Powerful Spot Welder: This battery spot welder delivers an instant peak power of 11000W on a full charge with dual-pulse technology. Welds up to 0.25mm nickel-plated strip, 0.3mm steel sheet, and 0.3mm iron sheet (battery level dependent). Produces strong, clean welds with low splatter - perfect for 18650/26650/36650 battery pack welding, plus appliance and tool battery repair
  • ✅ Auto Mode Operation: Simply touch both pen tips to the nickel strip - the welder fires instantly. The rotary knob allows precise adjustment of 0 - 100 power levels, so you can easily handle both delicate tasks (phone/button battery) and heavier applications (cylindrical battery packs) with optimal results every time. Note: This unit uses automatic mode (no foot pedal). Turn the knob to "A" before use. We recommend practicing on scrap metal first.
  • ✅ Low Battery Warning & High Safety: The battery level flashes while charging - a full charge takes about 2.5 hours and gives you up to 200 consecutive welds at max power. If something goes wrong (low voltage or overheating), on-screen icons light up and the welder automatically shuts off until conditions return to normal
  • ✅ Set Includes: Includes 1 x 5000 mAh SK1 battery spot welder (0.8 lb, 4.0" × 5.3" × 1.8"), 2 x welding pens, 1 x roll of nickel-plated strip, 1 x Type-C charging cable, and 1 x user manual. It makes a perfect gift for family, friends or DIY battery enthusiasts

Product Details

Brand:Awgem
Model:SK1P1
Size:SK1P1-5000mAh

Capacitor Battery Spot Welder, AWithZ UF20B 10.5KW Spot Welder, 3-in-1 Auto & Manual & Foot Pedal Three Modes Welding Equipment for 18650/LiFePO4 Lithium Battery Pack Building with Foot Pedal

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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
  • ✅ 3-in-1 Mode: Our spot welder has an automatic mode and a manual mode, as well as a foot pedal mode. The automatic mode is where you adjust to the proper setting, insert the spot welder and start working immediately. Manual mode is to adjust to the manual mode, press the button on the spot welding pen will output once. Foot Mode, when you use the foot pedal, the positioning of the soldering probe is much easier. It is very convenient to step on the foot pedal and the spot weld pen will output a signal once
  • ✅ 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 nickel plated sheet, stainless steel sheet, iron sheet, 0.2 nickel-plated and 0.2 nickel-plated butt-welded to achieve a material thickness of 0.4mm. There are 99 adjustable gears, with different gear requirements for different materials
  • ✅ Professional Battery Spot Welder: Equipped with built-in super energy storage capacitors, Ultra capacitors have many thoughts of cycle life, and the maximum pulse welding power can reach 10KW. 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. But please, you must use it by connecting it to the wall power and charging it while using it, because the Faraday capacitor stores very little electricity and will be consumed within a minute or two
  • ✅ Product design: The exterior design is rounded with no corners, so it won't hurt when a body part touches it. The shell is made of aluminum alloy, comfortable to the touch, beautiful appearance, not easy to scratch, but also has a flame-retardant nature, very safe

Product Details

Brand:AWithZ
Model:UF20B

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
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