Energy Density - The ratio of the energy available from a battery to its volume (Wh/L) or weight (Wh/kg).
AB5 - A metal alloy (e.g., LaNi5) capable of undergoing a reversible hydrogen absorption/desorption reaction as the battery is charged and discharged, respectively.
1.5 Ah/10 = 150 mA (A cell's capacity is not the same at all discharge rates and usually increases with decreasing rate.)
Self-Discharge - The loss of useful capacity of a battery on storage due to internal chemical action (local action).
Earthing system IT - Earthing system in which the neutral is isolated from the earth or connected to the earth via a high impedance and the various exposed conductive parts are connected to the earth via individual earthing circuits. An alarm must signal the appearance of a first insulation fault. The installation must be de-energized immediately in the event of a second insulation fault.
Battery cells - The interconnected battery elements that supply electrical power created by electrolytic reaction.
Short-Circuit Current (SCC) - The initial value of the current obtained from a battery in a circuit of negligible resistance.