Voltage Reversal - The changing of the normal polarity of a battery due to overdischarge.
Battery cells - The interconnected battery elements that supply electrical power created by electrolytic reaction.
Ambient Humidity - The average humidity of the surroundings.
Inverter (off-line or stand-by) - UPS configuration in which the inverter is parallel-mounted to the load supply line and backs up the mains. This configuration offers a substantial cost reduction but is applicable only to low outputs, under 3 kVA, because it results in an interruption lasting up to 10 ms during transfer and does not filter inrush currents.
Service Life - The period of useful life of a battery before a predetermined end-point voltage is reached.
Fuse - Device used for cutting off an electrical current in the event of an abusive condition.
Noise level - Acoustical decibel level of a source of noise, measured according to the applicable ISO standard.
