The 21700 Li ion battery is a powerful energy storage solution that has become very popular because of its high capacity, reliability, and versatility. It is a cylindrical rechargeable battery with dimensions measuring 21mm in diameter and 70mm in length, hence the name “21700”. 21700 Li ion battery has a wide range of applications in various industries, including household appliances, power tools, communication equipment and medical equipment. It is also a great choice for power banks thanks to its excellent energy density and discharge performance. It solves the common issues related to existing power banks. Read on to learn about them.

21700 Li ion battery

Common Issues Related to Existing Power Banks

Power banks have become a crucial accessory for modern-day consumers. They provide a convenient way to charge electronic devices, e.g. smartphones, tablets, or other gadgets, etc., on the go and help users stay connected in today’s fast-paced world. However, existing power banks are not without their limitations and flaws. The most common issues include the following:


  1. Insufficient Capacity

Many power banks available on the market feature limited battery capacities. This means they need to be charged multiple times to facilitate high-capacity devices or multiple devices.


  1. Slow Charging Speed

The majority of power banks have low output currents, which results in slow charging times for devices, particularly those with larger batteries.


  1. Swollen Battery

Over time, certain power banks can develop battery swelling issues which reduce their overall lifespan. Swollen batteries also pose potential safety risks.


  1. Short Lifespan

Short lifespan is another common issue related to existing power banks. After multiple charge and discharge cycles, their performance and capacity are reduced.

21700 Li ion battery

Product Highlight: ANKER Power Banks Series 6

The ANKER Power Bank Series 6 has many reliable products that are all viable solutions to address the various common issues listed above. The key to the improved performance of each product in this series lies in the 21700 High Rate Lithium-ion Battery 50SE. Manufactured and provided by our seasoned brand Sunpower New Energy, this 21700 Li ion battery has transformed the power bank technology to ensure great longevity, capacity, and safety. Read on to learn what features of the 5000mAh 21700 help solve common issues related to existing power banks.


21700 High Rate Lithium-ion Battery 50SE – Key Features

The 21700 High Rate Lithium-ion Battery 50SE from Sunpower New Energy is the driving force behind the ANKER Power Bank Series 6 products. It boasts several features that address the common issues related to existing power banks. The key features include the following:


  1. High Energy Density

The high energy density of this 21700 Li ion battery allows it to store more power in a smaller and lighter package. In this way, it increases the overall capacity of the power bank.


  1. High Discharge Rate

With a discharge cut-off voltage of 2.5V and a charging cut-off voltage of 4.2V, this 21700 Li ion battery can deliver power quickly and efficiently to charge devices faster.


  1. Excellent Endurance

The 21700 High Rate Lithium-ion Battery 50SE is stable, safe, and reliable. It can withstand harsh environments, including temperatures as high as 120℃. Furthermore, the battery can endure over 70 cycles at high temperatures with a discharge efficiency of over 90%.


  1. Long Cycle Lifespan

With over 600 cycle life, this 21700 Li ion battery ensures that the ANKER Power Bank Series 6 products can deliver reliable and consistent performance over an extended period.

Sunpower New Energy


Overall, existing power banks have many common issues, such as insufficient capacity, slow charging speed, short lifespan, and more. Because of this, many top power bank brands, including ANKER, are nowadays using dependable solutions like the 21700 Li ion battery. ANKER uses the 21700 High Rate Lithium-ion Battery 50SE by Sunpower New Energy to ensure efficiency and reliability in its Series 6 power bank products. This 21700 battery 5000mAh is an innovative product with features like high energy density, excellent endurance, long cycle life span, and high discharge rate.


Sunpower New Energy is a high-tech cylindrical power lithium-ion battery manufacturer. We specialize in manufacturing high-performance, safe, stable, and innovative batteries and battery cell solutions. With a strong focus on innovation, we are committed to providing our customers with first-class power battery solutions. Our wide range of quality products, attention to detail, and dedication to safety make us a trusted partner for power bank brands looking for advanced battery technology. Visit our website to learn more about our company and explore our range of innovative battery solutions.

For more information about Li-ion battery, please check High Rate Battery: Enhanced Performance and Safety.