What Is the Battery C-Rate, Discharge Current & Power Calculator?
C-rate is a standardized measure of the rate at which a battery is discharged relative to its maximum capacity.
How Does the Battery C-Rate, Discharge Current & Power Calculator Work?
Multiplying capacity in Ah by C-rate gives current in Amperes; dividing 60 minutes by C-rate gives discharge time.
Battery C-Rate, Discharge Current & Power Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
I = C_{\text{rate}} \times Q, \quad t = \frac{1}{C_{\text{rate}}} \text{ hours}, \quad P = I \times V
Discharge current, time duration, and power from C-rate.
How to Use the Battery C-Rate, Discharge Current & Power Calculator
- Input nominal capacity in Ah, desired C-rate, and nominal voltage.
Step-by-Step Example Calculation
EV Fast Acceleration Pack
Input Values:
nominalCapacityAh:60
cRateMultiplier:2
cellNominalVoltageVolts:3.65
Worked Steps: At 2C, discharge current is 120 A for 30 minutes delivering 438 W continuous power.
Understanding Your Result
Provides continuous current in Amps, run time in minutes, and output power in Watts.
Factors That Affect the Result
- High C-rates (> 3C) induce thermal stress and accelerated electrode degradation.
When Should You Use This Calculator?
- DC fast charging sizing, drone motor battery matching, and electric vehicle inverter power sizing.
Assumptions & Limitations
- Assumes ideal linear discharge without Peukert capacity derating.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Universally accepted standard in electrochemical engineering.