Characteristics of Discharging

Characteristics of Discharging

1. Final Discharging Voltage

The final discharging voltage is the battery terminal voltage in close circuit voltage per cell to which a battery discharging safely and maximize battery life. The higher discharging current is, the lower final discharging voltage of battery should be .

Discharging Current Final Discharging Voltage(VPC)

Discharging Current

Final Discharging Voltage(VPC)

Up to 0.1CA








Above 1.1CA


2 Battery Discharging Characteristics:

The discharging capacity of battery depends on the discharge rate being used and ambient temperature. 

Figure 1,2 and 3 show the different discharging current corresponding to discharging capacity at 20 oC(68oF) to 25oC(77oF) for FP, LFP and CFP types batteries. They show that the rated capacity of a battery is reduced when it is discharged at a value of current that exceeds its 10-hours or 20-hours rate.

3 Temperature Effects in Relation to Battery Capacity.

At a higher temperature, the capacity of battery increases and conversely at a lower temperature, the capacity of battery decreases. Figure 4 shows the effects of different temperature in relation to battery capacity.


Can calculate the batteries' rated capacity as following formula if the ambient temperature of tested battery is not 20oC-25oC(68oF-77oF).

C= Ct



C: rated capacity 

Ct: the tested capacity on t 

t: the ambient temperature of 

the tested battery 

k: the coefficient of temperature. It will be

increased if the discharge current 


k=0.006 20 hours and 10 hours rated 

capacity testing, 

k=0.01 3 hours and 1 hours rated

capacity testing.

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