Polarity - In electricity, the condition of being positive or negative.
Shelf Life - The duration of storage under specified conditions at the end of which the battery still retains the ability to give a specified performance.
COS phil - A measure of the phase shift between the fundamental current wave and the fundamental voltage wave observed at the terminals of a non-linear load.
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.
Intermittent Test - A test during which a battery is subjected to alternate periods of discharge and rest according to a specified discharge regime.
Energy Density - The ratio of the energy available from a battery to its volume (Wh/L) or weight (Wh/kg).
Noise level - Acoustical decibel level of a source of noise, measured according to the applicable ISO standard.
