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Views: 0 Author: Site Editor Publish Time: 2026-06-15 Origin: Site
Whether used in consumer electronics, medical devices, energy storage systems, or electric vehicles, batteries gradually lose performance over time. This natural degradation process is known as battery aging. To evaluate how a battery will perform after months or years of use, manufacturers conduct a series of aging tests before the battery enters mass production.
Battery aging tests help engineers understand changes in capacity, internal resistance, cycle life, safety, and overall reliability. The results are critical for product design, quality control, and certification.
This article explains the most common battery aging test items and why they are important.
Battery aging refers to the gradual deterioration of battery performance caused by:
Repeated charge and discharge cycles
Chemical reactions inside the cell
Temperature exposure
Calendar aging during storage
Mechanical stress
Aging affects:
Capacity
Internal resistance
Power output
Charge acceptance
Safety performance
The purpose of aging tests is to simulate real-world usage and predict long-term battery behavior.
To determine how much capacity remains after a certain period of use.
The battery undergoes repeated charge-discharge cycles under specified conditions.
For example:
Charge: 0.5C
Discharge: 0.5C
Temperature: 25°C
Number of cycles: 300, 500, or 1000
Capacity retention is calculated as:
Capacity Retention (%) = Remaining Capacity ÷ Initial Capacity × 100%
Cycle Number | Capacity Retention |
|---|---|
0 | 100% |
300 | 92% |
500 | 88% |
1000 | 80% |
This is one of the most important indicators of battery lifespan.
To determine how many charge-discharge cycles a battery can complete before reaching its end-of-life criterion.
Many manufacturers define battery life as ending when capacity drops to:
80% of original capacity
70% for certain applications
Cycle life is particularly important for:
Energy storage systems
Electric vehicles
Industrial equipment
Medical devices
To measure how internal resistance changes during aging.
As batteries age:
Internal resistance increases
Heat generation rises
Voltage drop becomes larger
Power capability decreases
Common methods include:
AC impedance testing
DC resistance testing
Age | Internal Resistance |
|---|---|
New | 20 mΩ |
500 Cycles | 28 mΩ |
1000 Cycles | 40 mΩ |
Resistance growth is often a key indicator of battery health.
To evaluate battery stability under elevated temperatures.
45°C
60°C
70°C
Storage durations may range from:
7 days
30 days
90 days
Capacity loss
Voltage change
Swelling
Leakage
Internal resistance increase
This test accelerates aging and reveals potential reliability issues.
To determine battery performance in cold environments.
0°C
-10°C
-20°C
-40°C
Discharge capacity
Voltage stability
Power output
This is especially important for:
Outdoor equipment
Medical devices
Automotive applications
To study battery degradation during storage rather than active use.
Batteries are stored at various:
Temperatures
States of charge (SOC)
For extended periods.
Temperature | SOC |
|---|---|
25°C | 50% |
25°C | 100% |
45°C | 50% |
45°C | 100% |
Capacity loss
Self-discharge rate
Resistance increase
Calendar aging is critical for batteries that spend long periods in standby mode.
To measure how much energy a battery loses while not in use.
Fully charge the battery.
Store for a specified period.
Measure remaining capacity.
7 days
30 days
90 days
1 year
Low self-discharge performance is especially important for emergency and backup devices.
To evaluate battery performance under different discharge currents after aging.
0.2C
0.5C
1C
2C
5C
Some batteries may retain capacity but lose high-rate discharge capability over time.
This test identifies such degradation.
To monitor physical deformation during aging.
Lithium polymer batteries
High-energy-density lithium cells
Measure:
Thickness increase
Weight change
Visual appearance
Excessive swelling may indicate internal gas generation and potential safety risks.
To ensure structural integrity throughout battery life.
Electrolyte leakage
Corrosion
Seal failure
Leakage is unacceptable in applications such as:
Medical devices
Industrial equipment
Consumer electronics
To evaluate battery behavior at elevated temperatures.
Surface temperature
Heat generation
Voltage behavior
Thermal stability becomes increasingly important as batteries age.
To verify that aged batteries remain safe.
After aging, batteries may undergo:
Overcharge testing
Short-circuit testing
Crush testing
Nail penetration testing
Thermal abuse testing
A battery that is safe when new must also remain safe after years of use.
To determine whether apparent capacity loss is reversible.
After aging:
Rest the battery.
Recharge under standard conditions.
Re-test capacity.
This helps distinguish temporary performance loss from permanent degradation.
To assess overall battery condition.
SOH typically considers:
Remaining capacity
Internal resistance
Power capability
SOH (%) = Current Capacity ÷ Rated Capacity × 100%
Battery management systems often use SOH to estimate remaining useful life.
Many battery manufacturers perform aging tests according to standards such as:
Performance requirements for lithium batteries.
Safety requirements for portable rechargeable batteries.
Safety and reliability testing.
Transportation safety testing.
ISO 12405
SAE standards
OEM-specific requirements
Battery aging tests help manufacturers:
Predict service life
Improve product quality
Verify safety
Optimize battery chemistry
Meet certification requirements
Reduce warranty risks
For customers, aging test data provides valuable information about how a battery will perform throughout its expected lifetime.
Battery aging tests are essential for evaluating long-term performance, reliability, and safety. A comprehensive aging program typically includes capacity retention testing, cycle life evaluation, internal resistance measurement, temperature storage testing, self-discharge analysis, swelling inspection, and safety verification.
By understanding how batteries age under different conditions, manufacturers can design better products, improve quality control, and ensure that batteries continue to deliver dependable performance throughout their service life. Whether for consumer electronics, medical devices, industrial equipment, or energy storage systems, aging testing remains one of the most important steps in battery development and qualification.
