FNRSI Adjustable Battery Pack Welder Review – Pros & Cons – WESTOBiG FNRSI Battery Spot Welder

The WESTOBiG FNRSI Battery Spot Welder is a remarkably compact powerhouse, serving as a pocket-sized forge for all your battery assembly and repair needs. It employs sophisticated double-pulse spot welding technology, which acts like a tiny, high-speed blacksmith, striking twice to ensure welds are not only stable but also exceptionally firm, thereby forging a bond that will endure. Furthermore, it houses a substantial 5000mAh high-rate power lithium battery within its shell, which is the very heart of this device, providing long-lasting energy for your projects. Consequently, this welder is not merely a tool; it doubles as a 5V/2.1A power bank, enabling it to act as a lifeline for your mobile devices when you are working remotely, and you need a quick recharge. The FNRSI Adjustable Battery Pack Welder transforms complex battery work into a task of surprising simplicity.

Moreover, the intelligence of this FNRSI Adjustable Battery Pack Welder is immediately evident through its user-centric design. It features a bright, 1.8-inch high-definition FFT color LCD screen, which is the window into the device’s soul, clearly displaying all vital information such as battery voltage, temperature, and current status at a glance. But that is not all; it also offers deep customization, because you can precisely tailor settings for preheating, pulse length, interval, and the number of connection points, allowing for granular control over the welding process. This flexibility is the key that unlocks professional-grade results, while its maximum welding current of 1200A and four combination gear adjustments give you the necessary muscle and finesse to tackle various materials. Indeed, the device can effectively weld nickel, iron, and stainless steel sheets, with a respectable maximum thickness of $0.25\text{mm}$, proving that great power can come in a small, portable package.

Finally, safety and versatility are woven into the very fabric of this device. A built-in intelligent temperature control probe functions as a diligent guardian, vigilantly protecting the unit against the dangers of over-temperature, low voltage, and short circuits, thus offering peace of mind during intensive use. In addition to its primary function, this FNRSI Adjustable Battery Pack Welder is incredibly portable; consequently, it is an indispensable companion for both professional technicians constructing battery packs and hobbyists working on their DIY projects, because its compact dimensions make it easy to carry. Ultimately, the FNRSI Adjustable Battery Pack Welder is a comprehensive solution, combining portability, power, and precision, and therefore, it is an essential piece of equipment for anyone dealing with 18650 or similar battery cell construction and repair, whether you are in a workshop or out in the field.

FEATURES:
– Doubles as a power bank
– Double Pulse welding tech
– Welds 0.1mm to 0.25mm metal
– 1200A max welding current
– 4-gear power adjustment
– Color LCD screen display
– Includes smart safety protection
– Adjustable welding settings

The WESTOBiG FNRSI Portable Battery Spot Welder uses double pulse welding technology for strong, stable welds. It has a maximum welding current of 1200A. The welder can handle metal thickness from $0.1\text{mm}$ to $0.25\text{mm}$. It is suitable for iron, stainless steel, and nickel strip, commonly used in $18650$ battery packs. Users can precisely control the power with a $4$-gear adjustment system. A color LCD screen displays welding status and settings. The device includes smart safety protection features. It also offers adjustable welding parameters like preheating and pulse time. The built-in $5000\text{mAh}$ battery doubles as a convenient power bank.

PROS:
– Great value
– Exceptional quality
– Neat, compact, and very easy to use
– Outstanding design
– Pays for itself quickly
– Doubles as a battery bank
– Comes with a roll of nickel tab stock
– Easy to understand instructions
– Exceptionally well packaged
– Reusable box for storage
– More power than expected
– Worked great
– Helpful for tool battery repairs
– Buenísimo
– Worked great for my needs
– Convenient that it’s portable
– Easy to use

CONS:
– Less detailed instructions
– No setting recommendations
– Failed after limited use
– Poor customer support
– Not for long weld sessions

The WESTOBiG FNRSI Battery Spot Welder is a portable, compact, and well-designed handheld spot welder offering more power than expected, capable of welding 0.1MM to 0.25MM nickel strip for iron, stainless steel, and 18650 battery packs. Users found it easy to use with clear instructions and appreciated the exceptional quality, neat packaging in a reusable box, and the inclusion of a roll of nickel tab stock. It features double pulse and four adjustable gears, and it conveniently doubles as a battery bank, proving helpful for tool battery repairs and providing great value that quickly pays for itself. However, some users noted less detailed instructions, a lack of setting recommendations, limitations for long weld sessions, failure after limited use, and poor customer support. Read more…

FNRSI Brass Spot Welding Pen Features

FNRSI Brass Spot Welding Pen Features

The image shows a brass spot welding pen, which is a component of the FNRSI Handheld Double Pulse Welder. It features a professional design for spot welding. The grip is comfortable with silicone anti-slip material. A key feature is the detachable welding pen head. This replaceable design means the user does not need to replace the entire pen.


FNRSI Welder Showcases Double Pulse Welding Technology

FNRSI Welder Showcases Double Pulse Welding Technology

The image prominently displays an FNRSI SWM-1 portable spot welder. Its screen is illuminated, showing various settings and a ‘Double Pulse Welding Technology’ label. This technology releases two pulses during welding. One pulse cleans the metal’s oxide layer. This action reduces spark spattering. The second pulse ensures consistent energy output. This process reliably improves the quality of the weld. The device is used for welding materials like 0.25MM nickel strips.


High-Rate, High-Quality Batteries in the WESTOBiG FNRSI Spot Welder

High-Rate, High-Quality Batteries in the WESTOBiG FNRSI Spot Welder

This image is an exploded view of the WESTOBiG FNRSI Battery Spot Welder. It highlights the power source of the device. The spot welder uses two high-rate power lithium batteries. These are described as high-quality A-grade batteries. The product literature emphasizes that it rejects cheap B-grade batteries. The image shows the internal layout of the battery pack and main circuit board.


Portable Spot Welder Doubles as a Power Bank

Portable Spot Welder Doubles as a Power Bank

This image showcases a portable spot welding machine that has a dual function. It can also be used as a power bank. The device includes a USB 5V/2.1A output. This allows it to charge USB devices. A mobile phone is shown charging from the device. The screen shows a 75% charge on the phone. This makes it a versatile two-in-one tool.


Portable Intelligent Color Screen Spot Welding Machine

Portable Intelligent Color Screen Spot Welding Machine

The image shows a FNRSI SWM-10 Portable Intelligent Color Screen Spot Welding Machine. This is an adjustable battery pack welder. The device is black with a digital screen displaying various settings. It comes with a pair of spot welding pens, a USB-C charging cable, and what appears to be extra welding tips and a metal ring accessory. The red and black cables are visible. The model name “SWM-10” is printed on the bottom.


FNRSI SWM-18 Spot Welder for Efficient Battery Pack Assembly

FNRSI SWM-18 Spot Welder for Efficient Battery Pack Assembly

The image shows the FNRSI SWM-18 Portable Intelligent Color Screen Spot Welding Machine. It highlights the device’s capability for ‘one touch welding’ for high efficiency. The machine is connected to weld multiple cylindrical batteries into a pack. It is designed to create firm welds and excellent solder joints. The welder can handle nickel plate, sheet iron, and steel sheet up to a maximum thickness of $0.25\text{mm}$.



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Best Fnrsi Adjustable Battery Pack Welder Deals

FNRSI Battery Spot Welder, 5000m Portable Handheld Spot Welder Double Pulse 4 Combination Gears Adjustable Spot Welding 0.1MM-0.25MM for Iron/Stainless Steel/Nickel Strip /18650 Battery Pack

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Key Features

  • ✅ 【Double Pulses Welding】Two pulses are released simultaneously in welding-one cleans the oxide layer on welderment, reducing the spark spattering, and the other keeps on welding to ensure the consistency of energy output and improvement o f welding stability
  • ✅ 【A-Grade Battery& 2in1】 The spot welder is equipped with 2 high rate power A-Grade batteries (5000mAH large capacity) . You could use it to weld thousands of spots after fully charged. And you could also use it as a power bank
  • ✅ 【Adjustable Output& Wide Application】4 combination gear adjustment. The welding thickness is 0.1-0.25mm. It can be used to weld nickel sheet, iron sheet, statinless steel sheet, aluminum sheet
  • ✅ 【Brass Spot Welding Pen 】The head of welding pen is detachable. You don`t need to replace the whole welding pen if the head is damged. And the welding pen is made of brass, solid and endurable!
  • ✅ 【Colorful Screen】With 1.8 inch LCD colorful screen, shows you the welding status, the battery voltage, temperature, preheat time, pulse time, interval time, charging voltage/current/power and over temperature/low voltage/short circuit warning indicator

Product Details

Brand:WESTOBiG
Model:Swm-10

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

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Key Features

  • ✅ 🔋 High-Capacity Dual A-Grade Batteries with Power Bank Function: Equipped with two powerful 8000mAh A-grade batteries, this spot welder supports thousands of welds on a single charge. It also functions as a portable power bank, adding convenience for tech-savvy users on the go
  • ✅ 🔧 99-Level Adjustable Power for Precision Control: Featuring 99 fine-tuned power settings, this welder offers precise control across a wide range of materials. It effectively welds nickel strips, iron, stainless steel, and aluminum between 0.1mm and 0.25mm, making it ideal for battery pack assembly and light metalwork
  • ✅ ⚡ Dual Pulse Technology for Clean & Stable Welds: Advanced dual pulse welding ensures professional-grade results—the first pulse removes oxidation to reduce sparks and splatter, while the second pulse delivers consistent energy for smooth, reliable welds. Perfect for both professionals and DIY enthusiasts
  • ✅ 🖊️ Heavy-Duty Brass Welding Pen with Replaceable Tips: Built to last, the included brass welding pen offers superior durability and heat resistance. Removable pen tips allow easy replacement without changing the whole pen, saving you time and money in the long run
  • ✅ 📺 1.8" Color LCD Screen with Smart Safety Alerts: Stay in control with a 1.8-inch color LCD display that shows real-time status—battery voltage, temperature, preheat time, pulse duration, interval time, and charging data. Integrated safety alerts for overheating, low voltage, and short circuits ensure safe operation at all times

Product Details

Brand:Docreate
Model:Spot Welder

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

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

Battery Spot Welder, 11 Gear Adjustable Double-ended Replaceable Pen Tip Spot Welder, Automatic and Manual Modes, Welding Plated Nickel Sheets for DIY 18650 Battery (Black-Upgrade)

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Key Features

  • ✅ Innovative Dual-Tip Design: Features both a micro needle tip for precision welding on thin materials and a macro cone tip for deep penetration on thick materials, doubling versatility and durability in one tool.
  • ✅ Precision Micro Welding: The micro needle tip achieves ultra-thin material welding with high accuracy (+0.05mm), preventing piercing and ensuring clean, reliable connections.
  • ✅ Efficient Macro Welding: The macro cone tip delivers balanced heat distribution for deep welding on thicker materials, reducing the heat-affected zone by 30% to prevent weak joints.
  • ✅ Premium Material & Long Life: Constructed from high-conductivity aluminum oxide copper, it offers exceptional electrical performance and a extended service life of over 5000 cycles.
  • ✅ Easy to Use - ONLY 2 buttons, our spot welder the buttons are labeled,easy to use. The battery spot welder does not need to leave our palm. Press and hold the power switch button on the side for 2 seconds with your middle finger, press the gear adjustment button on the top with your index finger once, and press and hold for 2 seconds to adjust the automatic or manual mode.

Product Details

Brand:AWithZ
Model:H1
Color:Black-upgrade

Battery Spot Welder, Farad Capacitor Portable Mini Welder Spot 3000F with LCD Screen, 120 Levels Adjustable Spot Welding Machine 18650 Battery Energy Storage, Nickel Strip Support 0.1-0.3mm

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Key Features

  • ✅ 📺 Clear OLED Display – Real-Time Data at a Glance: Our battery spot welder features a high-visibility OLED screen that clearly displays capacitor values, voltage levels, and other key parameters. Monitor your welding status in real-time to ensure precise, efficient performance every time
  • ✅ 🧠 Smart & Safe – MCU Precision Control: Built with intelligent microcontroller (MCU) technology, this welder offers accurate current output control via high-quality MOS. Enjoy features like auto welding mode, adjustable current levels, delay settings, temperature monitoring, and overheat alerts—engineered for both performance and protection
  • ✅ 🔧 High Efficiency with Replaceable Welding Tips: Equipped with a versatile, detachable welding pen design, this unit includes 4 interchangeable welding needles for extended use. Quick and easy to replace, it ensures long-term operation without compromising weld quality
  • ✅ ⚙️ 120-Level Adjustable Power Output: Customize your spot welding precision with 120 adjustable power levels. Whether you're working with different thicknesses of nickel strips or battery types, this fine-tuned control lets you achieve flawless welding results tailored to your specific needs
  • ✅ 👌 Simple Operation & Long-Term Reliability: Just press and hold the power button for 5 seconds to turn on/off; tap once to navigate settings. With user-friendly functions like auto mode, memory recall, and a 5-minute auto-shutdown, it’s perfect for professionals and hobbyists alike. Questions during use? Our responsive customer support is ready to help

Product Details

Brand:AGOAL
Model:Spot Welder 552
Size:Spot Welder, 120 Levels
Color:Spot Welder, 120 Levels

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

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

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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:‎SE-223
Size:Medium
Color:Black
Dimensions:7.87401574 X 7.87401574 X 7.87401574 Inches

VLOXO Battery Spot Welder, Battery Welder 99 Gear Adjustable Handheld Spot Welder with LCD Screen Automatic and Manual Modes Portable Spot Welding Machine for Welding Nickel Strips and Iron

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Key Features

  • ✅ Integrated Design: VLOXO battery spot welder power supply and welding pen are combined into one, you can weld easily without an external welding pen. The mini welder is designed for one-handed operation. freeing your other hand to hold the nickel strip, making welding a breeze.This cordless spot welder is only suitable for small battery nickel sheets.
  • ✅ LCD Digital Display: The Spot Welder comes with a digital display , and its functions include mode selection, gear setting, preheating time, and delay display. Click the SET button to trigger the settings of language, sleep time, screen brightness, etc
  • ✅ Dual Modes and 99 Adjustable Gears: The handheld spot welder adopts allow you to freely choose the output power to meet your spot welding needs; the design of automatic and manual modes increases the flexibility of spot welding, dual pulse output, and more precise welding.Switch between modes effortlessly for seamless welding experiences
  • ✅ Multifunctional Spot Welder: VLOXO portable spot welder is very suitable for welding electronic devices that fail due to battery damage and various types of batteries, such as cylindrical batteries, button batteries etc. And support welding nickel-plated sheets, stainless iron sheets or stainless steel sheets, and the solder joints are firm and beautiful
  • ✅ Safety and Reliable: Professional Spot Welding Machine adopts a multi-protection design and has an intelligent temperature detection system built in. When the device temperature is detected to be higher than 65 degrees, the device will automatically power off and stop spot welding, making your spot welding more secure

Product Details

Brand:VLOXO
Model:Docreate-757
Color:Black
Dimensions:7.72 X 1.61 X 0.98 inches

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
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