In the lithium battery market, different quality battery products have significant differences in performance and cost. This article will compare the A-grade lithium battery and the sub-grade lithium battery in detail in terms of capacitance, voltage, internal resistance, charge and discharge rate, cycle life, safety and price, to help consumers understand the main differences between the two and make an informed choice.

At Lishen, substandard batteries will be registered and sold to the market.

1. Capaciy

The higher capacitance of the A-grade battery can provide longer battery life and greater energy storage, while the sub-grade battery is relatively inferior in terms of power storage, which may lead to more frequent charging and is suitable for devices with low battery life requirements.

2. Voltage

A-grade LFP battery: The standard voltage is 3.2V, which can provide stable power output to ensure the normal operation of the device.

Sub-grade lithium battery: The voltage may be lower, such as 3.0V or lower. This difference may affect the power output of the battery, which in turn affects the performance of the device.

Analysis: The standard voltage provided by the A-grade battery can ensure the stability and performance of the device, while the voltage of the sub-grade battery is lower, which may not perform as well as the A-grade battery in some applications.

3. Internal resistance

A-grade lithium battery: Low internal resistance, generally between 30mΩ and 50mΩ. This means that the battery loses less energy during charging and discharging, has higher efficiency, and generates less heat.

Sub-grade lithium battery: High internal resistance, such as 60mΩ to 80mΩ. This can lead to higher energy loss and more heating problems, affecting the efficiency of the battery.

Analysis: Lower internal resistance helps improve the energy efficiency and safety of the battery, and A-grade products perform better in this regard, while sub-grade products may face problems such as reduced efficiency and increased heat.

4. Charge and discharge rate

Higher charge and discharge rates allow A-grade batteries to perform better in high power demand and fast charging scenarios, while sub-grade products are limited in these aspects and may require longer charging times and low power output. 

5. Cycle life

The longer cycle life of A-grade lithium batteries reduces replacement frequency and long-term use costs, meaning that the battery can be used longer while maintaining high performance. Sub-grade products may require more frequent replacements, affecting overall economic efficiency.

6. Safety

A-grade lithium battery: It has comprehensive safety protection measures, including overcharge protection, over-discharge protection, short-circuit protection and thermal management system, and its design focuses on safety.

Sub-grade lithium battery: It may only have basic safety protection and lack more advanced protection functions.

Analysis: A-grade performs better in terms of safety, providing users with more reliable use guarantees. Sub-grade products may have some deficiencies in safety design, and more caution is required when using them.

7. Price

Although the price of A-grade is higher, its advantages in performance, life and safety may make it more cost-effective in long-term use. Although the price of sub-grade products is lower, the disadvantages in performance and safety may increase subsequent costs.

Summary

Through the above comparative analysis, it can be seen that A-grade lithium batteries have excellent performance in capacitance, voltage, internal resistance, charge and discharge rate, cycle life, safety, etc., and are suitable for applications with high requirements for performance and reliability. Although sub-grade lithium batteries are cheaper, they perform poorly in many aspects, may need to be replaced more frequently, and require extra attention in terms of safety. When purchasing lithium batteries, consumers should make choices based on their own needs, budget, and requirements for battery performance to ensure the best user experience and long-term value.