What is c rate in battery？
In a battery, C-rate tells you how fast the battery is charged or discharged relative to its capacity.
A simple way to read it:
- 1C = full charge or discharge in 1 hour
- 0.5C = full charge or discharge in 2 hours
- 2C = full charge or discharge in 30 minutes
Example:
- A 50Ah battery at 1C = 50A discharge current
- The same 50Ah battery at 2C = 100A discharge current
- A 20Ah battery at 1C = 20A discharge current
Why it matters:
- A higher C-rate means the battery can deliver power faster
- It is important for products like EVs, drones, AGVs, jump starters, and power tools
- But higher C-rates can also create more heat and may reduce battery life if not designed properly
So, in one sentence:
C-rate is the speed rating of a battery’s charging or discharging performance.
Here’s an easy formula:
Current (A) = C-rate × Battery Capacity (Ah)
For example:
- 10Ah battery at 1C = 10A
- 10Ah battery at 3C = 30A