Noise level - Acoustical decibel level of a source of noise, measured according to the applicable ISO standard.
Capacity Retention (or Charge Retention) - The fraction of the full capacity available from a battery under specified conditions of discharge after it has been stored for a period of time.
Voltage Delay - Time delay for a battery to deliver the required operating voltage after it is placed under load.
Distortion (individual) - Ratio between the rms value of an nth order harmonic and the rms value of the fundamental.
Protection index (IP) - Index indicating the capacity of an electrical device to resist environment conditions. It is made up of three digits (e.g. IP 205), each corresponding to a type of environmental risk. The higher the number, the greater the capacity to resist. First digit (0 to 6) - capacity to resist penetration by solid objects. Second digit (0 to 7) - capacity to resist penetration by liquids. Third digit (0, 1, 2, 3, 5, 7, 9) - mechanical strength.
Interference (high-frequency) - High-frequency parasitic current that is either conducted (electrostatic origin) or radiated (electromagnetic origin) by a device.
Reversal - The changing of the normal polarity of a battery due to overdischarge.
