Meta Description
Learn the relationship between internal resistance and battery capacity in LiFePO4 batteries. Optimize performance and battery selection.
Internal Resistance vs Capacity in LiFePO4 Batteries
Introduction
Many users assume that higher capacity always means better performance. However, internal resistance plays an equally important role.
Understanding the Relationship
- Capacity = total stored energy
- Internal resistance = energy loss factor
👉 Both must be optimized
High Capacity with High Resistance
Problems:
- Reduced usable capacity
- Increased heat
- Lower efficiency
Low Resistance with Moderate Capacity
Advantages:
- Better real-world performance
- Higher efficiency
- Longer lifespan
Why Capacity Alone Is Not Enough
Two batteries:
- Same capacity
- Different resistance
👉 The one with lower resistance performs better in actual applications
Impact on System Design
Engineers must consider:
- Capacity requirements
- Resistance consistency
- Application load profile
Best Selection Strategy
- Choose low-resistance cells
- Ensure matching within battery pack
- Verify manufacturer testing data
Conclusion
Capacity and internal resistance must be considered together for optimal battery performance.