Our battery cell advantages
1. Performance parameter comparison
New A-grade battery cells with indicators
Accurate rated capacity (e.g., 3000 mAh ± 3%)
Internal resistance ≤ 17 mΩ (high consistency)
Cycle life: 1000 cycles (capacity ≥ 80%)
Self-discharge rate ≤ 3%/month (factory standard)
Discharge performance supports continuous discharge greater than 5C.
2. Safety differences
- New A-grade battery cells
- Passed puncture, overcharge, and short-circuit tests (such as UL certification);
- Built-in CID current shut-off valve and PTC thermal protection;
- The electrolyte does not decompose, the SEI film is stable, and the risk of thermal runaway is low.
- Disassembled battery cells:
- Potential for internal dendrite growth due to long-term use (prone to short circuits);
An explosion-proof valve or CID may have triggered a failure.
- The electrolyte dries out or decomposes, making it prone to bulging and high-temperature ignition.
3. Consistency comparison
A-grade battery cell
Same batch capacity, internal resistance, voltage difference ≤ 3%, suitable for series and parallel grouping (such as electric vehicle batteries).
- Disassembled battery cells:
Sources are mixed, and the aging degree varies, which may lead to the "barrel effect" (overall performance degraded by a single source) after packaging.
4. Lifespan and reliability
- Brand new A-grade product:
Calculate the lifespan from first use and predict the usage period (e.g., 3-5 years).
- Disassembled battery cells:
The remaining lifespan is unpredictable and may be close to scrap.
High-rate equipment is only suitable for A-grade battery cells. Disassembled battery cells are prone to overheating and damage under high current.
5. Implicit cost comparison
Disassembling battery cells may seem cheap (e.g., 2-5 yuan per section), but it carries hidden risks:
- Additional investment is required to screen battery cells using capacity separation/matching equipment.
- Frequent replacement costs (short lifespan)
Safety risks may lead to equipment damage (with higher repair costs).
Summary: Prioritize the A-grade battery cell selection scenario
1. High safety requirements: medical equipment, electric vehicles, energy storage power stations.
2. Long-term use needs: solar street lights, home energy storage systems.
3. High magnification or low-temperature environment: drones, power tools, polar equipment.
Disassembled battery cells are only suitable for short-term testing, low-risk DIY projects (such as flashlights, power banks), and must be tested using professional equipment.
Purchase suggestions
- A-grade battery cell verification: The supplier is required to provide a factory inspection report (including capacity, internal resistance, and cycling data);
- Avoid disassembling battery cells: Beware of phrases such as "zero cycle" and "surplus stock," which are often used for refurbishing scrapped battery cells.
The essence of choosing A-grade battery cells lies in reducing system risks and improving long-term cost-effectiveness, especially in large-scale applications where the benefits are more obvious.