SeeSii Portable Battery Welder Review – Pros & Cons – SeeSii Battery Spot Welder

The SeeSii Portable Battery Welder is a marvel of miniaturization, a compact powerhouse that fits in the palm of your hand yet wields the power to fuse metal with a single spark. It is a tiny titan in the world of DIY battery projects, offering a precision and portability that belies its small stature. This handheld wizard, with its universal battery tester, acts as a divining rod for power, and it can help you to diagnose your batteries with remarkable accuracy and to prepare them for their new life. It is not just a tool, but a key that unlocks the door to a world of endless creativity and and innovation. Whether you are working on a sprawling battery pack or a single coin cell, this spot welder stands as a testament to the idea that great power can indeed come in a small package. Furthermore, this mini welder makes a challenging task feel simple.

Like a master sculptor, the SeeSii Portable Battery Welder allows you to shape and to connect nickel strips with delicate precision, transforming disparate components into a unified, functional whole. The ability to weld nickel ranging from 0.1mm to 0.2mm is not just a specification, but it is a promise of versatility and of control. Consequently, you can tackle a wide range of projects, from robust 18650 packs for electric bikes to intricate arrangements for portable electronics. The process is swift and clean; therefore, it leaves behind a professional-grade weld that is both strong and visually appealing. This portable spot welding machine, therefore, eliminates the need for bulky, stationary equipment, and so it frees you to work wherever your imagination takes you. Ultimately, this tool is the bridge between a collection of parts and a fully functional device. Indeed, it makes a complex process feel effortless.

Finally, the SeeSii Portable Battery Welder is more than a piece of hardware; it is an invitation to explore and to build. With its compact form and its universal battery tester, it is the perfect companion for anyone who is passionate about electronics and DIY projects. For instance, you can repair old battery packs, and you can construct new ones from scratch, and you can breathe new life into forgotten gadgets. In other words, this tool is a catalyst for creation, transforming your ideas into tangible realities. Meanwhile, the ergonomic design ensures comfortable use during extended sessions. Overall, the SeeSii Portable Battery Welder is a game-changer for hobbyists and professionals alike, and it offers unparalleled freedom and functionality. Consequently, this tool is poised to become an indispensable part of your creative toolkit, and so you can tackle any battery project that comes your way. As a result, this little welder will prove its worth time and time again.

FEATURES:
– Handheld mini spot welder
– Universal battery tester
– Welds 0.1-0.2mm nickel
– Portable welding machine
– For 18650 batteries
– Works with lithium batteries
– Welds coin cells
– Good for DIY battery projects
– Includes a spot welder pen
– Battery powered for portability

The SeeSii Handheld Mini Spot Welder is a portable tool for various DIY battery projects. It includes a universal battery tester and is designed to weld 0.1mm to 0.2mm thick nickel strips. This battery-powered machine is suitable for welding 18650, lithium, and coin cell batteries and comes with a spot welder pen for precise work.

PROS:
– Works well for small jobs
– Great for 18650 packs
– Seller has great service
– Good value for the price
– Works well for a low price
– Saves money on repairs
– Good for welding light strips
– Rebuilds cordless tool batteries
– Easy and convenient to use
– Weld is plenty strong

CONS:
– Short attachments
– Batteries died, won’t recharge

The SeeSii Battery Spot Welder is a portable and affordable handheld device that is well-suited for small-scale projects, such as creating 18650 battery packs, rebuilding cordless tool batteries, and welding light strips. It is praised for its ease of use, convenience, and good value, with users noting that it saves money on repairs and produces a sufficiently strong weld. While the universal battery tester and its ability to handle 0.1-0.2mm nickel welding are key features, some users have reported issues with the battery dying and not recharging, and the attachments being too short. The seller, however, is noted for providing great service. Read more…

Mini Spot Welder in Action

Mini Spot Welder in Action

A man is using a SeeSii mini spot welder and battery tester. He is welding a pack of blue cylindrical batteries. The spot welder and battery tester is a compact, black device with a digital display. The device is connected to the battery pack with red wires. The man is wearing glasses and a plaid shirt. He is focused on the task. A laptop is visible in the background.


A Handheld Spot Welder with a Clear Color Display

A Handheld Spot Welder with a Clear Color Display

The image shows the display screen of a SeeSii handheld spot welder. The screen is in color and provides real-time information. It has a clear and intuitive interface. The display shows the preheating pulse output and welding delay. It also shows the main pulse output. There is a welding progress bar. The screen can be set to either manual or automatic mode.


Product Display for a Multi-functional Battery Tester

Product Display for a Multi-functional Battery Tester

The image shows a product designed to check the health of various batteries. It features a universal battery tester, the BT-168 PRO, which is a key accessory for the SeeSii Handheld Mini Spot Welder. The product can test different battery types, including 9V, button cell, and alkaline cylindrical batteries. The digital display on the device shows the battery’s voltage. This tool is useful for anyone working with batteries, as it provides an instant check on their condition.


SeeSii 18650 Battery Welder: Precise Welding Power

SeeSii 18650 Battery Welder: Precise Welding Power

This image shows the SeeSii 18650 Battery Welder in use. It highlights the device’s ability to weld nickel sheets. The welder has 80 adjustable power gears. These gears are for precise welding. The image shows a range of gears, from 1 to 80. Each gear corresponds to a specific welding strength. It is used to create strong, secure battery packs. The product is shown welding a battery pack of 18650 cells.


Portable Spot Welder and Battery Tester Kit

Portable Spot Welder and Battery Tester Kit

The image shows a SeeSii portable battery welder and a separate BT-168 Pro battery tester. A hand holds the black, handheld spot welder, which has a digital display and golden welding probes at the end. Next to it, the smaller battery tester displays a voltage reading. The image also includes accessories like a file, USB cables, welding wire, and metal strips, indicating this is a complete kit for welding and testing batteries.


Compact SeeSii Battery Welder Showcased with Charging Features

Compact SeeSii Battery Welder Showcased with Charging Features

The image features the SeeSii Portable Battery Welder. It highlights its Type-C fast charging capability. The battery has a 5000 mAh capacity for extra-long use. The product is also described as being portable and easy to travel with. A note at the bottom gives instructions on how to charge the device.


Portable Spot Welder for Battery Repair

Portable Spot Welder for Battery Repair

This image shows a SeeSii handheld spot welder in use. It is welding a nickel plate. This is for cylindrical batteries like 18650 and 32650. The welder can also work on mobile phone batteries. The image highlights the tool’s compatibility. It is compatible with various battery types.


SeeSii 18650 Battery Welder: Portable and Versatile Spot Welding

SeeSii 18650 Battery Welder: Portable and Versatile Spot Welding

The image showcases the SeeSii 18650 Battery Welder, a portable and convenient tool. It is an ideal companion for an electric toolbox. The product can be used for different tasks. It shows spot welding of cylindrical batteries, like the 18650 type. It also shows spot welding of a mobile phone battery. The device is also capable of welding button batteries. A person is also shown using the welder for a DIY electronics project. The welder is depicted as being suitable for various applications.


SeeSii Portable Battery Welder with 2-in-1 Design

SeeSii Portable Battery Welder with 2-in-1 Design

The image shows the SeeSii Portable Battery Welder, a device for welding batteries. It has an upgraded 2-in-1 design. The device is black and rectangular. It has a display screen. It has an integrated spot welding pen. The integrated pen is shown welding a battery pack. This is contrasted with a traditional spot welding pen. The traditional pen uses a separate handle and wires.


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Best Seesii Portable Battery Welder Pros Deals

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)

Image of 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)

$34.99 @ Amazon.com (Save 5%)

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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
  • ✅ 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
  • ✅ 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

SEESII Battery Spot Welder: Continuous Welding Function, 8.0Ah Rechargeable Capacity, Portable Spot Welder with Visual Display, Perfect for DIY/Repairs

Image of SEESII Battery Spot Welder: Continuous Welding Function, 8.0Ah Rechargeable Capacity, Portable Spot Welder with Visual Display, Perfect for DIY/Repairs

Key Features

  • ✅ 【8000mAh Rechargeable Battery】Experience unrestricted cordless operation for on-the-go or on-site use — charge the battery to full capacity (100%) prior to initial use to unlock peak performance
  • ✅ 【High-Power Welding Performance】Boasting a maximum output of 10080W, this portable spot welder outperforms conventional models in its class; It delivers reliable, consistent welds for 0.25mm nickel-plated sheets and 0.15mm pure nickel sheets
  • ✅ 【NEW FEATURE Continuous Welding】Customize the number of repeated weld cycles (default setting: 1); For thicker workpieces, increase the cycle count to achieve robust, long-lasting weld joints
  • ✅ 【Space-Saving Standable Structure】Integrated vertical stand design enables stable upright placement, reducing storage space while ensuring consistent precision during every welding operation
  • ✅ 【User-Friendly Visual Display】The intuitive screen provides real-time monitoring of welding progress, device temperature, and remaining battery life—enhancing operational convenience and control

Product Details

Brand:Seesii
Model:SE301

SEESII Battery Spot Welder: Handheld Spot Welding Machine with Rechargeable Battery, Mini Battery Welder for Nickel-Plated Sheets up to 0.2mm - for Battery Pack Assembly and Repair

Image of SEESII Battery Spot Welder: Handheld Spot Welding Machine with Rechargeable Battery, Mini Battery Welder for Nickel-Plated Sheets up to 0.2mm - for Battery Pack Assembly and Repair

$29.99 @ Amazon.com (Save 14%)

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Key Features

  • ✅ 【Wireless, Portable Design】Built-in 3000mAh rechargeable battery supports cordless operation and easy portability, eliminating cable constraints and enabling flexible use anytime, anywhere
  • ✅ 【Visual Display Screen】Real-time voltage, gear settings and welding mode are clearly displayed, simplifying operation steps and ensuring accurate adjustments for stable welding effects
  • ✅ 【80 Adjustable Gears】Realizes refined welding power regulation, perfectly adapting to nickel sheets of different thicknesses with a maximum welding thickness of 0.2mm for nickel-plated sheets and 0.15mm for pure nickel sheets, meeting diverse welding requirements
  • ✅ 【Reusable Cleaning File】Equipped with a reusable file to remove carbon deposits on the welding tip, maintaining stable welding performance and extending the tip's service life
  • ✅ 【Durable Aluminum Shell】Boasts a sturdy aluminum shell that enhances texture and durability, resisting wear and tear for long-term reliable use

Product Details

Brand:Seesii
Model:SE209
Color:Black
Dimensions:9.8031495963 X 2.2047244072 X 0.9055118101 inches

SEESII Battery Spot Welder: 9600mAh Cordless Battery Welder, 0.1-0.25mm Nickel Strip Compatibility, LCD Display, 10-90 Adjustable Gears, Foot Pedal Control, for Battery Packs DIY & Repair

Image of SEESII Battery Spot Welder: 9600mAh Cordless Battery Welder, 0.1-0.25mm Nickel Strip Compatibility, LCD Display, 10-90 Adjustable Gears, Foot Pedal Control, for Battery Packs DIY & Repair

Key Features

  • ✅ Built-in 9600mAh Rechargeable Battery​: No more tangled power cords! Grab this spot welder and work anytime, anywhere; Note: For optimal performance, fully charge it to 100% before first use
  • ✅ Upgraded 0.1-0.25mm Battery Spot Welder: Dual pulse + pedal control for effortless welding of 0.1-0.25mm nickel plates; Perfect for batteries, hardware & electronic components
  • ✅ LCD Display: Real-time battery voltage readout—key for great welding! Easily check levels and recharge (Please charge when below 7.3V)
  • ✅ Easy to Operate: Compact & lightweight (saves home space)—easy to take anywhere; Press the foot switch: red light flashes 3x fast, one power output = welding done!
  • ✅ Beginner-Friendly Tips: 1. Charge fully upon receipt, then practice multiple times to find the right welding strength; 2. Do not touch the two-pin clamp during use—risk of internal fuse explosion and equipment damage

Product Details

Brand:Seesii
Model:SEE-08
Dimensions:1 X 1 X 1 Inches

Seesii Portable Welder Handheld, 110V 120A Portable Welding Machine with Goggles & Chipping Hammer, Compatible with for 3/32"-1/8" Rods, Suitable for Home DIY Repair and Automotive Repair Welding

Image of Seesii Portable Welder Handheld, 110V 120A Portable Welding Machine with Goggles & Chipping Hammer, Compatible with for 3/32"-1/8" Rods, Suitable for Home DIY Repair and Automotive Repair Welding

$79.98 @ Amazon.com (Save 33%)

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Key Features

  • ✅ PORTABLE HANDHELD WELDING MACHINE: The SeeSii handheld welder measures is 10*10 inch, weighs only 3.9 pounds. compact and portable design makes it easy to use in a variety of work environments. It is great for aerial work, which can be easily operated with one hand.
  • ✅ SUPPORTS MULTIPLE RODS SIZES : This portable welder machine fit for 3/32″- 1/8″(1.2-3.2mm) welding rods. Support one click quick replacement of welding rods. This Stick welder ideal for E6011,E6013,E6014,E7018. Easily weld stainless steel,mild steel,iron and other metal materiaSUPPORTS MULTIPLE RODS SIZES : This portable welder machine fit for 3/32″- 1/8″(1.2-3.2mm) welding rods. Support one click quick replacement of welding rods. This Stick welder ideal for E6011,E6013,E6014,E7018. Easily weld stainless steel,mild steel,iron and other metal materials.
  • ✅ SMART IGBT INVERTER TECHNOLOGY: Hand Held Welder utilizes IGBT inverter technology, which improves the welder's current stability and energy efficiency. The technology also simplifies the welding process, resulting in smoother arc initiation, less spatter, and more stable and reliable performance. Built-in 360° Cooling Technology and specific overheat protection, effectively protect the internal circuit of the welding machine from damage and ensure safe and stable use.
  • ✅ 20-120Amp Welding Output: Come with 20-120Amp welding output adjustable, simple knob design, 6 variable current adjustment. Accurate current output make the welding work easier and the welding effect is more perfect
  • ✅ Complete Welding Accessories:In this package, will get 1*handheld welder machine, 1*Ground Clamp, 1*Auto Darkening Goggles, 1* Chipping Hammer, 1*Welding Brush, 20 *Welding Rod and 1*toolbox. Meet all your needs in welding.

Product Details

Brand:Seesii
Model:FA209

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)

Image of 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)

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

SEESII Capacitor Spot Welder: Battery Spot Welder with 3000F Capacitor, 250 Gear Adjustable, 1.8'' LCD Display, Spot Welding for 0.1-0.3mm Nickel Strip, for Battery Pack Making/Repair

Image of SEESII Capacitor Spot Welder: Battery Spot Welder with 3000F Capacitor, 250 Gear Adjustable, 1.8

Key Features

  • ✅ AC-Powered Spot Welder: This SEESII SE-223 battery spot welder delivers up to 1400A from 3000F supercapacitors; provides stable, high-energy output for spot welding 0.1-0.3mm nickel strips; ideal for battery pack building and repair
  • ✅ Precision Control with LCD Screen: This spot welder for lithium batteries offers 250 adjustable power levels in 0.1 increments; fine-tunes settings via a 1.8-inch LCD display; accommodates different nickel thicknesses and battery types for consistent, professional-grade welds
  • ✅ Flexible Dual Operation Modes: Designed as a professional-grade battery spot welder, it supports automatic trigger mode and manual foot pedal mode; allows hands-free welding or precise control depending on task; optimizes workflow when working with varied battery assemblies
  • ✅ Durable Aluminum Alloy Build: Made with aviation-grade aluminum for superior heat dissipation and impact resistance; compact and portable design suits on-the-go use in battery welding, electronic assembly, and DIY projects
  • ✅ Smart Cooling & Safety Circuitry: This advanced spot welder features a built-in power balancing circuit and intelligent fan control; protects internal capacitors and extends the life of your battery welder by preventing overheating and reducing mechanical wear

Product Details

Brand:Seesii
Model:‎SE301PRO
Size:Medium
Color:Black
Dimensions:7.87401574 X 7.87401574 X 7.87401574 Inches

Battery Spot Welder, Portable Handheld Battery Spot Welder for Lithium Batteries, 18650 Battery, 0.1-0.25mm Nickel Strips, Welding Nickel Sheets, Iron, 11 Gear Adjustable and Auto Manual Modes

Image of Battery Spot Welder, Portable Handheld Battery Spot Welder for Lithium Batteries, 18650 Battery, 0.1-0.25mm Nickel Strips, Welding Nickel Sheets, Iron, 11 Gear Adjustable and Auto Manual Modes

Key Features

  • ✅ 🔋 Wide Application: Compatible with 18650, 26650, 36650 cylindrical batteries, and smartphone batteries, this welder is perfect for DIY battery pack repairs, refurbishing broken electronics, and extending device life. A cost-effective and eco-friendly alternative to replacement
  • ✅ 🔧 No Welding Pen Needed: This handheld spot welder is designed for ultimate portability. With a built-in power source and integrated welding tips, you can weld anytime, anywhere—no external welding pen required. Ideal for both home and on-the-go repairs
  • ✅ 🧠 Easy to Operate: With clearly labeled buttons, operation is a breeze—even for beginners. Simply hold the side power switch for 2 seconds to activate, and press the mode selector to choose from automatic or manual welding. Fits in your hand for effortless control
  • ✅ ⚙️ 11 Adjustable Power Levels: With 11 precision-controlled output levels, you can match the welding power to your material: levels 1–3 for phone batteries, 4–6 for 0.1mm nickel strips, and 7–11 for 0.12–0.15mm nickel strips. One full charge delivers over 200 welds, making this tool efficient and reliable for any project
  • ✅ 🛡️ Built-in Safety System: Equipped with a high-quality polymer battery, this mini spot welder includes overcharge protection, overheat protection, short-circuit protection, battery temperature alerts, and low voltage alarms. It even supports breakpoint welding, with ultra-low power consumption and extended standby for peace of mind

Product Details

Brand:AGOAL
Model:Spot Welder 756
Size:7.7x1.6 inch

Battery Spot Welder, 8000mah Portable Handheld Spot Welder with LCD Screen, 99 Gears Pulse Adjustable Spot Welding Machine 0.1mm-0.25mm for Iron, Stainless Steel, Nickel Strip, 18650 Battery Pack

Image of Battery Spot Welder, 8000mah Portable Handheld Spot Welder with LCD Screen, 99 Gears Pulse Adjustable Spot Welding Machine 0.1mm-0.25mm for Iron, Stainless Steel, Nickel Strip, 18650 Battery Pack

Key Features

  • ✅ 🔋 Powerful Dual A-Grade Batteries with Power Bank Function: Equipped with two high-capacity 8000mAh A-grade batteries, this welder supports thousands of welds on a single charge. Bonus: It doubles as a portable power bank, providing added functionality for tech-savvy users
  • ✅ ⚡ Dual Pulse Welding for Cleaner, More Stable Results: Our spot welder uses dual pulse technology—the first pulse removes surface oxidation to reduce spark and splash, while the second pulse delivers consistent energy output for stable, high-quality welds. Ideal for professionals and DIYers seeking precision
  • ✅ 🔧 Adjustable Power Levels & Broad Material Compatibility: Features 99 Gears adjustable power settings for optimal control. Welds materials ranging from 0.1mm to 0.25mm, including nickel strips, iron, stainless steel, and even aluminum—perfect for battery pack assembly and light metal work
  • ✅ 🖊️ Durable Brass Welding Pen with Replaceable Tips: The included brass spot welding pen is tough and long-lasting. Removable pen tips allow for easy replacement without changing the entire pen, making it more cost-effective and convenient
  • ✅ 📺 1.8" Color LCD for Real-Time Monitoring: Stay fully informed with a 1.8-inch full-color LCD screen that displays battery voltage, temperature, preheat time, pulse duration, interval time, and charging metrics. Built-in alerts for overheat, low voltage, and short circuits keep your work safe and controlled

Product Details

Brand:AGOAL
Model:Battery Spot Welder
Size:Spot Welder, 99 Levels
Color:Spot Welder, 99 Levels

Hosyond 5000W Battery Spot Welder, Portable Adjustable Spot Welding Machine for 18650 Lithium Batteries, Welding Nickel Sheets 0.1-0.25mm

Image of Hosyond 5000W Battery Spot Welder, Portable Adjustable Spot Welding Machine for 18650 Lithium Batteries, Welding Nickel Sheets 0.1-0.25mm

Key Features

  • ✅ 【Voltage digital display:】 With LED digital display design, you can directly see the battery power and charge the machine in time. (Please fully charge before first use, and recharge when the voltage is lower than 7.3V).
  • ✅ 【Reliable and durable: 】The spot welder has good performance and a long service life, with a safe ABS shell, two spot welding pens with good conductivity and low contact resistance. The tip is replaceable.
  • ✅ 【Wide application:】 The 5000w spot welder has adjustable output current, spot welding 0.1-0.15mm nickel-plated steel sheets and 0.1mm pure nickel sheets, which is very suitable for welding 18650 battery pack spot welding iron sheets, stainless steel sheets.
  • ✅ 【Simple operation: 】Just press the nickel sheet with two welding pens and step on the foot switch, wait about 0.5 seconds to output spot welding, and then release the foot switch.
  • ✅ 【Compact size:】 Light weight, portable design, the body is 6.5*3.86*2.36 inches, you can use this machine in different occasions. If you have any questions during use, please feel free to contact us.

Product Details

Brand:Hosyond
Model:560
Size:5000W
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