With the rapid development of the power bank industry, battery solutions are also being continuously optimized, from the original 18650 battery and lithium-ion battery solutions to the current 18650, 21700, lithium polymer batteries, and other diversified coexistence. When selecting a power bank OEM/ODM manufacturer, what should brands consider? Let’s talk about it.

一、Mainstream Battery Types for Power Banks

Comparison of different types of batteries for power bank

At present, the power battery solutions are mainly 18650 (diameter 18mm, height 65mm) and lithium polymer battery solutions, while the 21700 (diameter 21mm, height 70mm) battery solution was originally mainly used in the field of new energy vehicles. Due to its many advantages, such as high energy density, high safety performance, and long cycle life, it has begun to be adopted in the mid-to-high-end power bank market in recent years. For example, the Joway TFT screen series high-power power bank applies the 21700 battery solution.

In recent years, lithium-ion phosphate batteries have also been quite popular in the new energy vehicle industry. Due to their strong thermal stability (auto-ignition temperature of 800 °C), non-dissolving, long cycle life, and extremely high safety performance, they are particularly suitable for more complex outdoor environments. Consequently, it has now penetrated the outdoor portable energy storage industry, like the Joway portable power station smart series (HW01/HW02) adopts the lithium iron phosphate battery solution!

二、How to choose a power bank battery solution?

1.Lightweight and stylish—Choose lithium polymer battery

High design flexibility, customizable shapes (square, thin sheets, etc.), high energy density, high safety performance

2.High-end and large capacity—Choose 21700 battery

Compared with the traditional 18650 battery, the 21700 battery has greatly increased the single cell capacity by increasing the diameter (18mm → 21mm) and height (65mm → 70mm). Power banks featuring low internal resistance generate less heat with superior thermal dissipation while demonstrating higher resistance to internal short circuits, extended cycle life, enhanced safety performance, and more compact form factors at equivalent capacity ratings.

3.Outdoor energy storage battery—Choose lithium-ion phosphate battery

High safety performance, excellent thermal stability, almost no risk of combustion and explosion, suitable for complex outdoor environments

Long service life: cycle life of more than 2000 times (capacity retention rate ≥80% after 2000 cycles).

4.Low-end models—Choose 18650 batteries

The cost is relatively low, with a high cost-performance ratio, but the safety performance is slightly worse than others…

We are a power bank source factory with more than 20 years of experience and also a national high-tech enterprise integrating R&D, production, and sales. Currently, self-developed power banks mainly use lithium polymer batteries and 21700 batteries (Custom Battery Solutions), while the portable power station mainly uses lithium iron phosphate batteries. We support OEM, ODM, and gift customization. Welcome to consult!