1201101009080706050400.5 0.7 1.0 2.0 3.0 4.0 5.07.010.0Discharge time, hTubularplatePasted plateOPERATION AND CONSTRUCTIONDOE-HDBK-1084-95Lead-Acid Storage BatteriesBatteriesPage 20Rev. 0 Figure 9. Typical effects of discharge rate on battery capacity.Generating Stations and Substations.EffectsofDischargeRateandTemperatureonCapacityandLifeThe rate at which a battery is discharged and its operating temperature have a profoundeffect on its capacity and life. An example of the effect of discharge rate on battery capacityis shown in Figure 9 for traction batteries. This figure shows that batteries discharged at alow rate will be able to deliver a higher capacity than those discharged at a high rate.The depth of discharge also affects the life of a battery. As shown in Figure 10 for a typicaltraction battery, discharges beyond about 80% of capacity can be expected to shorten batterylife.Colder operating temperatures will yield a little extra life, but also lower the capacity of lead-acid cells. High temperatures yield higher capacity (see Figure 11) but have a detrimentaleffect on life.
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