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C Rate Formula:
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The C-rate represents the discharge current relative to the capacity of a battery. It indicates how fast a battery is being discharged relative to its maximum capacity. A 1C rate means the discharge current will discharge the entire battery in 1 hour.
The calculator uses the C-rate formula:
Where:
Explanation: The C-rate calculation helps determine how quickly a battery is being discharged relative to its total capacity, which is crucial for battery performance and lifespan.
Details: Understanding C-rate is essential for battery selection, performance optimization, and preventing damage from excessive discharge rates. It affects battery temperature, efficiency, and cycle life.
Tips: Enter current in Amperes (A) and capacity in Ampere-hours (Ah). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What does a 2C discharge rate mean?
A: A 2C discharge rate means the battery is being discharged at twice its capacity, so a 10Ah battery would be discharged at 20A, taking 30 minutes to fully discharge.
Q2: What are typical C-rates for different battery types?
A: Lead-acid batteries typically handle 0.2C-0.5C, Li-ion can handle 1C-2C, while high-performance LiPo batteries can handle 5C-10C or more.
Q3: How does C-rate affect battery life?
A: Higher C-rates generate more heat and stress, potentially reducing battery cycle life. Operating within manufacturer's specified C-rates ensures optimal lifespan.
Q4: Can C-rate be used for charging as well?
A: Yes, the same principle applies to charging. A 0.5C charge rate would charge a battery in approximately 2 hours.
Q5: What happens if I exceed the maximum C-rate?
A: Exceeding maximum C-rate can cause overheating, voltage sag, reduced capacity, and in extreme cases, thermal runaway or permanent damage.