10 Best 21700 Battery Power Bank Box In The Us - Black Friday 2024
Best Choice1
FUJILFUJIL 100W 21700mAh Portable Power Bank for Laptop, Transparent Design, Intelligent Screen, 2 USB A & USB C Ports for MacBook, iPhone, Android and More
Main highlights- What you get: 1 FUJIL 100W Power Bank, 1 100W USC-C Cable, 1 Travel Pouch, User guide
- Universal Compatibility: Ensures you can charge any device, anywhere. Its versatile design supports multiple charging standards, making it an essential accessory for tech users on the go.
- Transparent Design: The see-through design reveals the internal components, adding modern style and visual appeal. It allows users to see the inner workings, combining functionality with a sleek aesthetic. Ideal for tech enthusiasts on the go.
- Intelligent Display: Equipped with an intelligent display that provides real-time information on output distribution, voltage, amps, and remaining battery charge. Stay informed and in control with clear, precise readings.
- 21700mAh Large Capacity: The large 21700mAh capacity provides power for days with up to 7x charges for your mobile device, 1.2x MacBook charges, and 2.5x charges for iPad. Equipped with 2 high speed USB-A port and 1 USB-C port, charge up to 3 devices simultaneously.
- 100W PD Fast Charging: This portable charger features a 100W USB-C PD port, delivering rapid and efficient charging for laptops, tablets, and smartphones. Its high-capacity design ensures your devices stay powered up, keeping you connected and productive wherever you go.
9.8Exceptional
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Value for Money2
FUJILFUJIL 21700mAh 22.5W Portable Power Bank, Transparent Design, Intelligent Screen, 2 USB A, USB C Fast Charging & Lightning, Compact External Battery Pack with LED Display, for iPhone, Android and more
Main highlights- Universal Compatibility: Ensures you can charge any device, anywhere. Its versatile design supports multiple charging standards, making it an essential accessory for tech users on the go.
- Transparent Design: The see-through design reveals the internal components, adding modern style and visual appeal. It allows users to see the inner workings, combining functionality with a sleek aesthetic. Ideal for tech enthusiasts on the go.
- PD22.5W Fast Charging: This portable charger features a 22.5W USB-C PD port, delivering rapid and efficient charging for your mobile devices. Its high-capacity design ensures your devices stay powered up, keeping you connected and productive wherever you go.
- Intelligent Display: Equipped with an intelligent display that provides real-time information on output distribution, voltage, amps, and remaining battery charge. Stay informed and in control with clear, precise readings.
- 21700mAh Large Capacity: Provides power for days with up to 5x charges for your mobile device with featured 2 high speed USB-A port and 1 USB-C port. Charge up to 3 devices simultaneously.
9.7Exceptional
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3
PULUZ2-in-1 Cell Phone Wireless Charger Mobile Power Battery Charger Set,Portable Battery Charger with LCD Display and 2 USB Output Ports，DIY 4 * 21700 Solderless White Battery Box(Battery Not Included)
Main highlights- 【Reliable Customer Service】A good product is of course inseparable from a good service, if you have any questions about this product, please feel free to contact us. Our reliable customer service will reply you within 24 hours to provide you with a satisfactory solution.
- 【Multi-Function and Flexible Use】The portable charger has 2 USB output ports, with mobile phone wireless charging function, supports 22.5W+15W wireless charging, supports two-way fast charging, charging current up to 5A, efficiency up to 96%, suitable for Apple/Huawei/Samsung /Xiaomi/OPPO/vivo and other mobile phone fast charging.
- 【LCD Screen Display】The battery box has an LCD screen display, which accurately displays the battery power, and you can check the battery power status at any time. With LED indicator light, it provides effective instructions for your use. The power output uses the USB port. Plug in the data cable to achieve portability and charge at any time.
- 【Effective Security Protection】The battery box supports temperature loop control, automatic load detection/light load detection, input overvoltage, undervoltage protection, output overcurrent, overvoltage, short circuit protection, battery overcharge, overdischarge, and overcurrent protection. , IC over-temperature protection allows you to charge with confidence and use with peace of mind.
- 【DIY Mobile Power Supply】Large capacity, you can make a mobile power bank by placing 4 21700 flat-head batteries (battery not included in this product). The battery box can charge your battery or be used with the battery as a mobile power supply. on your mobile phone and other devices. (Note: Please pay attention to the positive and negative terminals of the battery)
9.6Exceptional
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4
MOUDOAUERCharging Bank Solder Free Kit, Plastic Power Bank Box DIY Charging Case Power Display Free Welding Case for 5x21700 Battery Case
Main highlights- Only supports 21700 flat-headed batteries. Do not use pointed batteries or aging batteries. Improper use of batteries may result in inability to output, especially after prolonged use in other locations and disassembly. (Please note that for DIY products, a certain level of understanding is required. Otherwise, improper operation may lead to issues such as motherboard burnout.)
- Ideal for home/outdoor activities, easy to operate, and convenient for disassembly and installation.
- Holds 5 pieces of 21700 flat head batteries, a solderless and reusable DIY battery case. (Batteries not included).
- Features power display, intelligent automatic shutdown in non-working state, LED light activated by long press or double click; Reverse installation does not damage the motherboard.
- Easy to install, requiring no soldering or secondary processing. Simply install the batteries correctly and assemble for use. It is also repeatedly disassemblable and replaceable.
9.4Excellent
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5
LIJIANILIJIANI Battery Charger Case,Portable DIY Power Bank Box with LCD Display 2 USB Output,Micro and Type c Input, Smart Charger for 3.7v Li-ion Rechargeable Battery (Battery Not Included)
Main highlights- Multifunctional charging case: 4 battery(0.7 inches in diameter - 2.56 inches long) charging case, LCD display battery voltage and current value, the remaining battery power. Can easily remove the battery to power other devices
- Mobile power function: filled with batteries, it is a 10000 mah rechargeable treasure (choose 4 2500 mah batteries), if you choose 3500 mah / a battery, it is 14000 mah rechargeable treasure. Not recommended, different sizes of batteries loaded into use at the same time
- Dual-port input : (MICRO and TYPE-C) 5V-2A, two USB output, 5V-2A, long press the switch can open the flashlight function
- Concern: This product does not include batteries, unfamiliar with Cylindrical lithium batteries, people without DIY spirit, please be careful to buy
- Bad battery detection function: if you load a bad battery, or the battery positive and negative poles are installed backwards, no battery symbols on the LCD display, only normal batteries appear battery symbols
9.3Excellent
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6
LHIABNNLHIABNN DIY Power Bank Box Flat Head Battery Charger Outer Case,2 USB Output Ports Plastic Shell Box with LCD Display,Micro/Phone/Type-c Input Port Power Bank Case (Black)
Main highlights- 【Widely Use】: Compatible For Phone 11 pro max X XR XS 8 7 6 plus/6/5S,for pad,for Samsung Galaxy S8 S7 S2/S3/S4, Note 2/3/4, HTC, for Sony, Xiaomi Motorola and other cellphones. Application - Suitable for various models of mobile phones that support wireless charging fuction.
- 【LCD Display】: Accurate display of power, keep the battery status at any time.Power bank and rechargeable 18650 battery charger. Plug and Play, power output using the USB port, plug the data cable to achieve portable, ready to charge.
- 【Intelligent 18650 Battery Charger】: Compatible with 18650 Flat head lithium battery (69mm length). Each battery slot is individual charging and detection. It automatically terminates charging when the batteries are full charged.(NOTE: Please notice the positive and negative poles)
- 【Easy to Use】: Compact and lightweight design for easy carrying; Easy to install and uninstall; Convenient take and use.
- 【DIY Power Bank】: Large capacity,8 x 18650 batteries (batteries not included). Dual USB power bank, two devices can be charged at same time.Three input ports,any usb cable can charge the power bank.
9.2Excellent
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7
Protect Your PowerProtect Your Power0 Battery Case, Soft Durable Material - Pack of 2 (Holds 2 Batteries)
Main highlights- [Protect Your Power] - The Slimline 21700 battery case is made of a soft durable rubber like material which will not crack or shatter. It keeps your batteries fully protected by keeping both battery terminals covered and safe. A micro-bevel lip holds the top on securely, ensuring your batteries remain in the case.
- [Keep Batteries Organized] The perfect battery storage case for your 21700 batteries. Place used/dead batteries in the case upside down to easily keep track of which batteries are depleted.
- [Excellent for the Outdoors] - Great to keep with your hiking gear or camping supplies for safe battery storage. Bring a spare set of batteries with you in your pack on a hike, or while camping, to keep your flashlight powered.
- [Contents] Includes 2x 21700 battery cases, each battery holder will hold 2x 21700 batteries. Design allows for storing protected or unprotected batteries up to 78mm in length.
- Batteries not included.
9.1Excellent
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8
XBERSTARXBERSTAR 18650 Power Bank case,Li-Ion Battery Storage Box -18650 Holder for Uninterrupted Power Supply UPS DIY Battery Special Plastic DIY kit (set1)
Main highlights- You will get;3S 40A BMS -US Charger -18650 Li-Ion Battery Holder -Pure Nickel Strip(not include batteries )
- Installation: Easy and simple to use and operate, no other tools needed to install.Install the battery according to the positive and negative sides on the circuit board. Be careful not to reverse it.
- High quality battery holder case with wire leads for easy soldering and connecting.Each battery holder comes with a case cover for keeping the battery in place
- Attention: There is a specific product description on the picture, please read it in detail.
- Attention: Do not mix the good battery and poor battery to use. The internal resistance of 3 battery capacity are closer will be better.
9.0Excellent
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9
BistookBistook DIY 1 Slot 3.7V 21700 Battery Box Battery Holder Battery Slot can be Spliced and Assembled Freely Plastic Material (6pcs 1-Slot)
Main highlights- Versatile Connection Options: Our 21700 battery holder can be linked in series or parallel, offering flexible configurations with included copper connectors to meet diverse needs.
- Premium Quality Materials: Crafted from durable PC+ABS material, with pure copper M3 screws for positive and negative terminals, this holder minimizes resistance. It supports a high current of up to 5A (max) and allows hassle-free use without soldering.
- Innovative Interlocking Design: Each battery case features a clear cover for added protection, enabling unlimited stacking and creative combinations, reminiscent of building blocks.
- Customer Care and Assurance: Suitable for DIY enthusiasts; batteries not included. We recommend using consumer-grade 21700 flat-top lithium batteries. This product comes with a 30-day return policy for a full refund or replacement in case of any issues. For inquiries, our team is available 24/7 to provide prompt and satisfactory solutions.
- Broad Applicability: Specifically designed for single 21700 3.7V flat-top cylindrical lithium batteries. Easily transform the battery box into a portable power bank by adding a circuit board. Ideal for various electronic projects, this holder not only sparks creativity but also delivers convenience and satisfaction.
8.8Very Good
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10
JJCJJC 24 Slots 21700/20700 Battery Case Holder, IP67 Water-Resistant & Shockproof Battery Storage Organizer Box for 21700 or 20700 Battery with Customized Holder, EVA Interior and Pressure Valve
Main highlights- The battery container is made of hard PP plastic, the inside lid and bottom with EVA foams are for sound absorption, better protects both terminal ends from damaging and impact. Anti-skid grooves constructed on the surface of the case for saving space and prevent your battery cases falling out accidentally.
- The battery case can store up to 24 x 21700 or 20700 batteries. It neatly holds the batteries snugly in place within the holder slots and keeps the contact ends from contacting each other. (Batteries are NOT included.)
- Size7.2x5.2x4.1”. It should be a good partner for organizing your batteries.
- Moreover, the 21700 battery storage box features an automatic pressure equalization valve to balance interior pressure and keep opening and closing smoothly.
- It has a solid snap closure and features a silicone sealing ring that protects your batteries from dust, moisture and shock. A 5mm diameter lock hole next to the closure allows you to double keep your batteries safety.
8.7Very Good
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