TRANSLUCENT CASE KL/P, KM/P, KH/P Range

Nickel Cadmium Pocket Plate Batteries

Technical Specifications

INTRODUCTION: The nickel-cadmium batteries are manufactured to support various loads. The KL/P range for L (long rate of discharge) lads, the KM/P range for M (medium rate of discharge), and the KH/P for H (high rate of discharge).

Battery Condition: The Nickel Cadmium batteries are delivered in charged condition filled with electrolyte. However, upon request they can be delivered discharged down to 0 V, without electrolyte as well. In this latter case the necessary potassium hydroxide is packaged separately in dry form. The batteries are accompanied with start up and operating guide.

Standards: Nickel Cadmium batteries tested according to IEC 623, UIO 854 and UIC 550 Standards.

Capacity: Nominal storage capacity (symbol: C5, unit: Ah) is obtained as follows: the battery discharged in advance will be charged with a constant current of 0.2 C5A for 7 hours at 20-25°C, then discharged to 1 V voltage with constant current of 0.2 C5 A. The product of the discharge current and the discharge time will give the nominal capacity.

The capacity of the battery is dependent upon the temperature of the environment and on the load. The storing capacity decreases when discharged with greater currents than the C5 rate and decreases slightly with lower operating temperatures.

Voltage:	Cell Profile
Nominal voltage: 1.2-1.5 V. Open circuit voltage: 1.28-1.36 V. Deep discharge voltage: the voltage of the cell beyond the nominal storage capacity if it is discharged below 1 V durably or repeatedly.

The battery is normally connected in parallel to constant voltage charger and load. In cases where the battery may be disconnected from the load, a constant current charger is recommended. The effect of increase/decrease of operating temperature must always be considered. A 10°C (50°F) increase/decrease in temperature would decrease/increase the charging voltage by 2.5%. The electrolyte temperature is recommended to remain below 40°C (104°F) or 50°C (122°F) in tropical climates.

A discharged battery is able to absorb high currents with favorable charging efficiency at the beginning of the charge cycle. The initial current has to be limited in order to avoid overheating and to ensure the applicability of the optimum charging device. The charging current should not exceed 0.2 C5 A for the KL/P and KM/P types, and C5 A for the KH/P types. All the 1.40-1.45 volts/cell voltage (trickle, charging) 80 to 85% of the storage capacity can be utilized. At 1.50 to 1.60 V/Cell equalize charge, the water consumption and gas evolution are increased while the charging time is reduced. It is recommended to charge at 1.48 - 1.53 V/cell.

The battery can also be charged in a short period of time with constant current. It is recommended to apply normal charge with a current of 0.2 C5 A for 7 hours. At the first phase of charging (approximately 4 hours) the voltage is slightly increased, the gas evolution is minimal, and 75% of the nominal storage capacity can be achieved. At the second phase, the voltage is rapidly increased and stabilized on a higher level and the gas evolution is increased. Charging can be maintained beyond 8 hours, but the greater portion of the energy charged is spent on water decomposition. The need for more frequent re-fillings with distilled water and for repeated controls will increase. Complete accelerated charging can also be performed in two steps: 0.4 C5 A for 3 hours and 0.2 C5 A for 1 hour. For conditioning charge, it is necessary to charge in 1.6-2 C5 A. It is recommended to maintain the 0.2 C5 A for 8 to 10 hours.

All preceding specifications are subject to change without notice