Enter the initial capacity, final capacity, and retention percentage into the calculator to determine the missing variable.

Capacity Retention Calculator

Retention
Loss
Energy
Cycle/EOL

Enter any 2 values to calculate the missing variable

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Capacity Retention Formula

The following formula is used to calculate the capacity retention for a given initial and final capacity. 

R = (C_f / C_i) * 100

Variables:

  • R is the retention percentage
  • Ci is the initial capacity in milliampere-hours (mAh)
  • Cf is the final capacity in milliampere-hours (mAh)

To calculate the capacity retention, divide the final capacity by the initial capacity and multiply the result by 100 to get the percentage.

What is Capacity Retention?

Capacity retention refers to the ability of a battery to retain its charge capacity over time. It is a measure of how well a battery can maintain its initial charge capacity after multiple charge and discharge cycles. High capacity retention indicates that the battery can hold a charge close to its original capacity, while low capacity retention means the battery’s ability to hold a charge has significantly diminished. This metric is crucial for evaluating the longevity and performance of batteries in various applications, including consumer electronics, electric vehicles, and renewable energy storage systems.

How to Calculate Capacity Retention?

The following steps outline how to calculate the Capacity Retention.

  1. First, determine the initial capacity of the battery (Ci).
  2. Next, determine the final capacity of the battery after a certain number of cycles (Cf).
  3. Next, calculate the retention percentage using the formula R = (Cf / Ci) * 100.
  4. Finally, calculate the Capacity Retention.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Initial Capacity (Ci) = 2000 mAh

Final Capacity (Cf) = 1800 mAh