What are the current methods for marking the capacity of lead-acid batteries?


At present, the capacity of lead-acid batteries has the following labeling methods, such as C20, C10, C5, and C2, which respectively represent the actual capacity obtained when discharged at a discharge rate of 20h, 10h, 5h, and 2h.If it is the capacity under 20h discharge rate, the label should be C20, C20=10Ah battery, which refers to the capacity value obtained by discharging 20h with C20/20 current. Converted to C5, that is to discharge at 4 times the current specified by C20, the capacity is only about 7Ah. The electric bicycle is generally discharged in 1~2h with high current, and the lead-acid battery is discharged in 1~2h (C1~C2). , Is close to 10 times of the specified current, then the electric energy it can actually supply is only 50% ~ 54% of the discharge capacity of C20.The battery capacity is marked as C2, which is the capacity marked at a rate of 2h discharge. If it is not C2, calculations should be made to obtain the correct discharge time and capacity. If the capacity indicated by the 5h discharge rate (C5) is 100%, if it is changed to discharge within 3h, the actual capacity is only 88%; if it is discharged within 2h, only 78%; if it is discharged within 1h, only 5h is left. 65% of the hourly capacity.The marked capacity is assumed to be 10Ah. So now the actual power of 8.8Ah can only be obtained with 3h discharge; if it is discharged with 1h, only 6.5Ah can be obtained, and the discharge rate can be reduced at will. The discharge current>0.5C2 not only reduces the capacity than the label, but also affects the life of the battery. It also has a certain impact. In the same way, for a battery with a marked (rated) capacity of C3, the discharge current is C3/3, that is, ≈0.333C3, if it is C5, the discharge current should be 0.2C5, and so on.



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  • Post time: Oct-27-2021