🔋 What Is C-Rate?

C-rate indicates how fast a battery is charged or discharged relative to its capacity.

Formula: C-rate = Current (A) ÷ Capacity (Ah)

• 2.5Ah cell at 2.5A → 1C
• 2.5Ah cell at 5A → 2C
• 10Ah pack at 20A → 2C

Higher C-rate = more stress on the battery.

🛠 How to Use the Calculator

1. Discharge Current (A): Enter the current drawn. Example: 10A.
2. Battery Capacity (Ah or mAh): Enter capacity; mAh converts automatically to Ah.
3. Optional Discharge Time: Enter if known; compares time-based vs current-based C-rate.

📊 Outputs

• Computed C-Rate: Discharge rate based on current & capacity.
• Estimated Discharge Time: Time (hours) = 1 ÷ C-rate. Example: 1C ≈ 1h, 2C ≈ 30min, 0.5C ≈ 2h.
• C-Rate Comparison: If discharge time entered, compares both C-rates for accuracy.

🎯 Why Use This Tool

• Prevent battery damage by not exceeding recommended C-rate
• Optimize battery and motor performance
• Design e-bike packs and parallel groups correctly
• Validate manufacturer claims for real-world discharge rates
• Quick estimations for any battery project