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VRLA(AGM)  battery

## 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 CurrentFinal Discharging Voltage(VPC)
Up to 0.1CA 1.75
0.11-0.17CA 1.7
0.18-0.25CA 1.67
0.26-1CA 1.6
Above 1.1CA1.3

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

1+k(t-25)

Note:

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

increased.

k=0.006 20 hours and 10 hours rated

capacity testing,

k=0.01 3 hours and 1 hours rated

capacity testing.