The duration of a battery is thus dependent on its discharge rate. Manufacturers provide discharge charts for their batteries. Charging and discharging rates have a major impact on the life of a battery. A battery that is discharged at a faster rate may not deliver the same amount of energy as a battery with a lesser discharge rate. Some manufacturers specify the capacity of a battery as a function of the discharge rate.
Temperature, too, influences the capacity of a battery. Batteries at high temperatures will have a better capacity that batteries loaded at low temperatures. Extremely high temperatures, however, can cause damage to the battery and greatly reduce capacity.
In addition to these factors, age is also a factor that determines the capacity of a battery. As a battery ages, its capacity reduces.