Wh

Years

The Battery Degradation Calculator is a tool designed to help you estimate the current State of Health (SoH) of your lithium-ion battery pack.

By providing information about your battery's capacity, charge cycles, depth of discharge, and age, you can get a rough idea of how much your battery has degraded over time.

- Enter your battery's original capacity in Watt-hours (Wh) or Kilowatt-hours (kWh). This is optional but will provide an estimate of the hypothetical maximum capacity based on the calculated SoH.
- Input the number of charge-discharge cycles your battery has undergone. This is optional if you specify the battery age.
- If you entered the charge cycles, you can also provide the average depth of discharge (DoD) your battery experiences during its cycles. This is expressed as a percentage from 0-100. If left blank, a standard value of 70% is assumed.
- Enter the age of your battery in years or months. This is optional if you specified the charge cycles.
- The calculator will display the estimated State of Health (SoH) as a percentage and, if capacity was provided, the hypothetical maximum capacity in Wh.

**State of Health (SoH):**A measure of a battery's current condition compared to its original condition when new.**Capacity:**The amount of energy a battery can store, typically measured in Watt-hours (Wh) or Kilowatt-hours (kWh).**Charge Cycles:**The number of times a battery has been charged and discharged. One cycle is typically counted when the total discharge equals the battery's capacity.**Depth of Discharge (DoD):**The percentage of a battery's capacity that is discharged during a cycle.

The calculator uses simplified formulas to estimate battery degradation based on charge cycles and age. These formulas are:

**Cycles Degradation**

**Age Degradation (in months):**

The calculated degradation values are subtracted from an initial SoH of 100%, and the result is clamped between 0% and 100%.

If the original capacity is provided, the hypothetical maximum capacity is calculated by multiplying the original capacity by the estimated SoH percentage.

$\mathrm{SoH}=100-\mathrm{Cycles\; Degradation}-\mathrm{Age\; Degradation}$This calculator provides a rough estimate based on simplified formulas and assumptions. The actual degradation of a battery depends on various factors such as battery chemistry, manufacturing quality, operating conditions, and temperature.

The results should be used as a general guide, not as a precise measurement of your battery's health.

The calculator's estimates are designed primarily to match lithium-ion batteries in electric vehicles. A more accurate assessment should be performed for critical applications or specialized battery systems.