What does LVD mean?

Low voltage disconnect (LVD) – during the battery discharge of an emergency light, there is a voltage where the battery has used it full capacity. Some emergency light circuit can detect the low voltage point and terminate the discharge (disconnect the battery from the lamps) so that the battery will not be over-discharged. For lead-acid and NiCd batteries, the end of useful capacity occurs when the voltage is approximately 87.5% of nominal; so for a 6-volt battery, the cut off is 5.25-volts and the 12-volt cut-off is 10.5-volts.


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