Static bypass switch - Power-electronics device that can be used to switch from one source to another without interruption in the supply of power. In a UPS, transfer is from Mains 1 to Mains 2 and back. Transfer without interruption is possible due to the fact that there are no mechanical parts and the ultra-fast switching capabilities of the electronic components.
Crest factor (Fc) - Ratio between the peak current value to the rms current value.
Volumetric Energy Density - The ratio of the energy output of a cell or battery to its volume (Wh/L).
Safety Vent - A venting mechanism designed into a cell which activates under specific conditions of abuse to relieve internal pressure.
Thermistor - A temperature sensitive resistor, usually made from specially processed oxides.
Drain - The current withdrawn from a battery during discharge.
Cathode - The electrode in an electrochemical cell where reduction takes place. During discharge, the positive electrode of the cell is the cathode. During charge in a rechargeable battery, the negative electrode is the cathode.
