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.
Internal Impedance - The opposition exhibited by a circuit element (cell or battery) to the flow of an alternating current (a.c.) of a particular frequency as a result of resistance, induction and capacitance.
Tolerance in % - Limit for allowable variations for a given quantity, expressed as a percent of the rated value.
Voltage-Keyed - A system which incorporates a mechanical identifier on batteries and devices to ensure only batteries of the correct voltage are connected to the device.
Circuit breaker (battery) - DC circuit breaker that protects the battery of a UPS.(back)
Electrode - The site, area or location at which electrochemical processes take place.
Service Life - The period of useful life of a battery before a predetermined end-point voltage is reached.
