Constant Current Discharge - A battery discharge regime whereby the current drawn during the discharge remains constant.
Redundancy (active) - Parallel UPS configuration in which several UPS units with equal outputs are parallel connected and share the load. In the event one UPS unit fails, the other units pick up its share without any interruption in the supply of power to the load. (back)
End Voltage (also see Cutoff Voltage) - The prescribed voltage at which the discharge (or charge, if end-of-charge voltage) of a battery may be considered complete.
Current Drain - The current withdrawn from a battery during discharge.
Crest factor (Fc) - Ratio between the peak current value to the rms current value.
Rechargeable (or "Secondary") Battery - A galvanic battery which, after discharge, may be restored to the fully charged state by the passage of an electrical current through the cell in the opposite direction to that of discharge.
Frequency Variation - A change in frequency of more than 3 Hz.
