The Difference Between Grade A, B, C Battery Cells

Grade A, B, and C cells are quality classifications for lithium battery cells, indicating the quality control standards and performance levels attained during production.

Grade A cells are those that fully meet technical parameter requirements without any anomalies during production. These cells are manufactured to precise specifications for parameters such as capacity, voltage, thickness, length, and width. Grade A cells deliver superior performance and are used in demanding electronic products.

Grade A battery cells offer the following advantages:

1. High capacity and energy density: The battery cell can store more energy per unit of volume or weight.

2. Good cycle life: Provides a longer service life, reducing the frequency of battery cell replacements.

3. Low self-discharge rate: The battery cell can maintain its state of charge (SOC) for extended periods when not in use.

4. High current output capability: The battery cell demonstrates excellent high current output performance.

5. Excellent temperature performance: The battery cell can operate reliably in both low and high-temperature environments.

6. High safety performance: The battery cell poses virtually no risk of thermal runaway.

7. Good consistency: The battery cells can prevent imbalance caused by variations in cell performance.

Grade B battery cells may have minor defects from production, such as slight variations in capacity or dimensions that do not meet order specifications. Consequently, their prices are generally lower than those of Grade A cells.

Grade C battery cells typically refer to Grade B cells that have been stored in warehouses for over eight months without shipment. Due to prolonged storage, these cells undergo self-discharge and are exposed to dust and moisture, resulting in performance degradation. Grade C cells exhibit poor safety and durability, with their performance deteriorating significantly after only a few charge cycles.

One of the primary reasons for lithium battery safety concerns is the use of Grade B and Grade C cells. These cells exhibit unstable capacity and voltage, which can increase safety risks and the likelihood of explosions.

Because the performance and safety of Grade B and Grade C batteries are inferior to those of Grade A batteries, they pose certain risks when used, especially in applications requiring high energy density and enhanced safety, such as battery energy storage systems (BESS).

Greensun high-voltage and low-voltage lithium batteries all use Grade A cells, prioritizing safety and quality. Strict cell screening and an intelligent BMS management system ensure that each battery delivers stable performance and reliable operation. We provide peace of mind for our customers.