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STANDBY USE General term of constant stand-by battery systems. Batteries are kept charged by trickle/float method at all times in preparation for unforeseen power disruptions.

TEMPERATURE COMPENSATION Compensation of charge voltage for temperature variation of a cell/battery or in its vicinity. Qualita- tively, charge voltage should be corrected to higher side for low temperatures and to lower side for high temperatures.

TERMINAL VOLTAGE AT DISCHARGE The voltage of a battery during discharging.

THERMAL RUNAWAY Such phenomena as an excessively high set-up voltage in constant-voltage charging of a battery and a very high battery temperature cause charge current to increase, which then raises the temperature further: this vicious cycle is called thermal runaway, which may, in the worst case, result in breakage of the battery due to heat.

TRICKLE CHARGE To charge a battery in the state of disconnection from the load to compensate for its self discharge.

TRICKLE LIFE The service life of a battery in the trickle use. Usually, the trickle life is the time expressed in years before the dischargeable time of the battery decreases to a half of the initial value.

UL Abbreviation of Underwriters Laboratories Inc. in USA. The UL establishes various safety standards, and performs official recognition of materials, parts and products.

UPS (Uninterruptible Power Supply) Equipment or system which is automatically connected to the load to supply power if the main power fails.

GLOSSARY OF TERMS FOR SEALED LEAD-ACID BATTERIES - CONTINUED

  • VALVE (ONE WAY VALVE) A valve on each battery which automatically releases gas from the battery when internal pressure of the battery exceeds a predetermined value: it prevents breakage of the battery due to excessive internal pressure caused by the gas generated by charging or other reasons. The valve also serves to prevent outside air from entering batteries.

Sealed Lead-Acid Handbook, Page 76

January 2000

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