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Powersonic Brand Specifications

Battery Capacity

The capacity of a battery is the total amount of electrical energy available from a fully charged cell. Its value depends on the discharge current, the temperature during discharge, the final (cut-off) voltage and the history of the battery.

Capacity, expressed in ampere-hours (AH), is the product of the current discharged and the length of discharge time. Battery capacity varies according to the discharge rate being used. Capacity increases when discharge current is less than the 10-hr. rate an(! decreases when the load current is higher.

The rated capacity of a Power-Sonic POWERGUARD Series battery is measured by its performance over 10 hours of constant current discharge at 68•f(20•C) to a final (cut -off) voltage of 1.8 volts per cell.

Power Sonic Batteries

Proper battery selection for a specific application can be made from the discharge curves shown for each model if the required time and current load are known.


Discharge Characteristics

Battery voltage decreases during discharge. The discharge curves in Figure 1 illustrate this for different discharge rates. "c" is the rated capacity of a battery. The discharge curves may be used for battery selection. It is advisable, however, to review the selection on the basis of graphs of individual data sheets.


Open Circuit Voltage

Open circuit voltage varies according to ambient temperature and the remaining capacity of the battery. Generally, open circuit voltage is determined by the specific gravity of the electrolyte. Discharging the battery lowers the specific gravi ty. Consequently, it is possible to determine the approximate remaining capacity of a battery from the terminal voltage. The O.C.V of a Power-Sonic battery is 2.15V/cell when fully charged and 1.95V/ cell when fully discharged.


Cut-Off Voltage

Cut-off or 'final' discharge voltage is the battery terminal voltage under load, i.e. in a closed circuit. to which the battery is safely discharged to maximize battery life. The appropriate cut-off voltage va ries according to the actual discharge current. As a rule of thumb, high amp. loads will tolerate a lower final discharge voltage than low amp. ones with longer run times.