(1) Klarus K2A Power Bank
(2) FLEX10 Li-ion Powerbank Plus 9000mAh
(3) WooGear 5000mAh Power Bank
(4) UGreen Nexode 25000mAh 200W Power Bank
(5) Nitecore NC10000 Highland Power Bank
(6) Nitecore NPB1 Waterproof Power Bank
(7) Nitecore NPB4 20000mAh Power Bank
(8) XTAR PB2SL QC 3.0 PD 3.0 18650 21700 Power Bank
(9) HY-08 Tactical Power Bank
Learn More About Them
In recent years, 21700 battery (Lithium Cell) have become increasingly popular in portable power banks due to their high energy density, longer lifespan, and superior performance compared to traditional 18650 battery. These power banks provide a reliable and efficient way to charge smartphones, tablets, laptops, and other electronic devices while on the go. Among the notable options available in the market today are several power banks that specifically use 21700 battery, offering a combination of compact design, high capacity, and fast charging capabilities.
For users seeking a more rugged option, the Klarus K2A Power Bank offers a durable design suitable for outdoor adventures. Equipped with 21700 battery, this power bank can withstand harsh conditions while delivering consistent power output. Its robust construction ensures that it remains reliable during hiking, camping, or other outdoor activities, making it a dependable companion for those who spend a lot of time away from conventional power sources. Klarus K2A is compatible with 3.6 V or 3.7 V 18650, 20700, and 21700 batteries.
The Nitecore NPB1 Waterproof Power Bank (IP68) is another excellent example of a 21700 battery powered device. Known for its efficiency and fast-charging capabilities, it provides sufficient energy to keep multiple devices powered throughout the day. Its advanced battery management system ensures safe operation and protects against overcharging, short circuits, and overheating. This makes it a suitable option for tech-savvy users who demand both safety and high performance.
For those looking for higher capacity, the FLEX10 Li-ion Powerbank Plus 9000mAh combines the benefits of 21700 battery with a moderate capacity suitable for everyday use. Its 9000mAh capacity allows multiple smartphone charges, making it a convenient option for daily commuters or travelers who need reliable power throughout the day. The slim design ensures that it remains easy to carry, striking a balance between capacity and portability.
The Nitecore NC10000 Highland Power Bank further enhances the performance aspect with a 10000mAh capacity, making it a versatile option for charging larger devices or multiple devices simultaneously. Its compact form factor ensures that it does not add excessive weight to a bag, while the 21700 battery provide stable and efficient energy output. This power bank is especially useful for those who often work remotely or travel frequently.
Smaller but efficient options such as the WooGear 5000mAh Power Bank offer portability without compromising on essential power needs. Using high-quality 21700 battery, these devices can quickly recharge smartphones and small gadgets, making them ideal for short trips or emergency use. Their lightweight designs make them easy to carry in pockets or small bags, providing convenience alongside reliable performance.
For users requiring extremely high capacity and fast charging, the UGreen Nexode 25000mAh 200W Power Bank stands out as a powerhouse. Equipped with multiple 21700 battery, this device can deliver up to 200W of output, making it capable of charging laptops, tablets, and even some gaming devices in addition to smartphones. Its massive capacity ensures that users can go on extended trips without worrying about running out of power, and the advanced battery management system guarantees safety and efficiency at all times.
The NITECORE NPB4 is a high-capacity 20000mAh / 72.8Wh waterproof power bank, equipped with four 21700 lithium-ion batteries. It features dual USB-A and one USB-C bidirectional output ports, with a maximum output power of 18W, and supports pass-through charging. With an IP68 rating, it is fully dustproof and can be submerged in up to 2 meters of water for 30 minutes. The housing is made of flame-retardant polycarbonate, making it durable, shock-resistant, and rugged. Weighing approximately 378g and measuring 103.5 × 51.3 × 49.5 mm, it is compact and portable. The NPB4 comes with a touch-sensitive battery level indicator to display remaining power, and includes multiple safety protections such as overcharge, over-discharge, overcurrent, short circuit, overvoltage, and temperature protection. It is ideal for outdoor adventures, hiking, camping, water activities, as well as home or travel emergency use, providing reliable power for smartphones, tablets, headlamps, GPS devices, and other small electronics.
XTAR PB2SL is a highly versatile 2-in-1 battery charger and power bank, compatible with 18650, 20700, and 21700 lithium-ion batteries, both protected and unprotected, allowing users to customize capacity by combining different batteries. It supports QC 3.0 and PD 3.0 fast-charging protocols, with an input of 5V/2A, 9V/2A, or 12V/1.5A, and QC/PD fast-charging output through USB-A and USB-C ports, delivering up to 18W of maximum output power. The PB2SL features smart energy balancing to automatically adjust charge and discharge between two installed batteries, and a digital display that shows real-time battery voltage, current, and remaining capacity, along with a “0V activation” function to revive over-discharged batteries. Multiple safety protections—including overcharge, over-discharge, overcurrent, short circuit, and overheat protection—ensure safe operation. Its compact, durable design includes a magnetic cover and built-in ribbon for easy battery insertion and removal, measuring approximately 125 × 58 × 28 mm and weighing about 85 g (without batteries), making it highly portable. The XTAR PB2SL is ideal for outdoor travel, field activities, DIY high-capacity power solutions, or emergency backup, providing reliable power for smartphones, tablets, headlamps, GPS devices, and other small electronics.
The HY-08 Tactical Power Bank ensures you never run out of power, featuring a modular design that lets you swap 21700 batteries in seconds for instant full charge. Its capacity is fully customizable—carry one, two, or even four 5000mAh cells to reach up to 20,000mAh, making it perfect for travel, outdoor adventures, or long days away from outlets. The power bank is designed for convenience and broad compatibility, supporting fast-charging protocols including QC, PD, PPS, FCP, DCP, AFC, and PE to charge a wide range of devices efficiently. A smart 4-stage LED indicator displays battery levels, and a special light signals active PD fast charging. Compact, rugged, and lightweight at just 85×50×25mm and approximately 100g (case only), the HY-08 is ideal for everyday carry. Please note that it is not water-resistant, and using it after exposure to water may create a safety hazard.
In conclusion, power banks utilizing 21700 battery offer a broad spectrum of options catering to different user needs. From compact, pocket-sized models like the UGreen Nexode 25000mAh, these devices provide reliable, efficient, and safe charging for a wide variety of electronic devices. The superior energy density, longer lifespan, and enhanced safety features of 21700 battery make them an excellent choice for modern portable power solutions. Whether for daily commuting, travel, outdoor adventures, or emergency use, these power banks demonstrate the versatility and advantages of 21700 battery in meeting the growing demand for portable energy in our digital lives.
For users seeking a more rugged option, the Klarus K2A Power Bank offers a durable design suitable for outdoor adventures. Equipped with 21700 battery, this power bank can withstand harsh conditions while delivering consistent power output. Its robust construction ensures that it remains reliable during hiking, camping, or other outdoor activities, making it a dependable companion for those who spend a lot of time away from conventional power sources. Klarus K2A is compatible with 3.6 V or 3.7 V 18650, 20700, and 21700 batteries.
Smaller but efficient options such as the WooGear 5000mAh Power Bank offer portability without compromising on essential power needs. Using high-quality 21700 battery, these devices can quickly recharge smartphones and small gadgets, making them ideal for short trips or emergency use. Their lightweight designs make them easy to carry in pockets or small bags, providing convenience alongside reliable performance.
XTAR PB2SL is a highly versatile 2-in-1 battery charger and power bank, compatible with 18650, 20700, and 21700 lithium-ion batteries, both protected and unprotected, allowing users to customize capacity by combining different batteries. It supports QC 3.0 and PD 3.0 fast-charging protocols, with an input of 5V/2A, 9V/2A, or 12V/1.5A, and QC/PD fast-charging output through USB-A and USB-C ports, delivering up to 18W of maximum output power. The PB2SL features smart energy balancing to automatically adjust charge and discharge between two installed batteries, and a digital display that shows real-time battery voltage, current, and remaining capacity, along with a “0V activation” function to revive over-discharged batteries. Multiple safety protections—including overcharge, over-discharge, overcurrent, short circuit, and overheat protection—ensure safe operation. Its compact, durable design includes a magnetic cover and built-in ribbon for easy battery insertion and removal, measuring approximately 125 × 58 × 28 mm and weighing about 85 g (without batteries), making it highly portable. The XTAR PB2SL is ideal for outdoor travel, field activities, DIY high-capacity power solutions, or emergency backup, providing reliable power for smartphones, tablets, headlamps, GPS devices, and other small electronics.
