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What is a C-rate (charge & discharge rate)?

What is a C-rate (charge & discharge rate)?

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Charge and discharge rate is amongst the key characterizing specification of a battery pack. To compare different battery packs with varying capacities the C-rate is used. A 1C-rate means that the discharge current will discharge the entire battery in 1 hour.

 

So if we offer a battery pack with a nominal capacity of 20Ah, 1C means 20A discharge current is available for 1 hour.

 

0,5C means 10A discharge current is available for 2 hours.

 

Next to the discharge time and the Amps, the C-rate also indicates the charging time of your battery pack. The higher the C-rate the faster it charges. For very high C-rates the cells of the battery pack, including the cell chemistry need to be chosen wisely, to guarantee a long battery life.

 

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