What is Lithium Battery C-rate and How to Calculate it?

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The C-rate of a lithium-ion battery refers to the rate at which the battery can discharge relative to its capacity. A C-rate of 1 means the battery can discharge its full capacity in one hour. For example, a 1 Ah battery discharged at a C-rate of 1 would provide a current of 1A.

To calculate the C-rate of a battery, divide the current by the capacity of the battery. For example, if you have a 3 Ah battery and you discharge it at a current of 6A, the C-rate would be 2C (6A ÷ 3Ah).

C-rate is an important factor to consider when selecting a battery for a particular application. Choosing a battery with a higher C-rate will allow it to deliver more power and discharge more quickly, but may reduce the overall capacity and lifespan of the battery. Conversely, choosing a battery with a lower C-rate will provide a longer lifespan and more capacity, but may not be able to deliver as much power as quickly.

It’s important to note that the C-rate should be within the manufacturer’s specifications for the battery to avoid damaging the battery or reducing its lifespan.

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