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NEC Definitions of the Day 18 Sep 2025

jar546

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Battery.
A single cell or a group of cells connected together electrically in series, in parallel, or a combination of both. (CMP-13)


Battery, Flow. (Flow Battery)
An energy storage component that stores its active materials in the form of one or two electrolytes external to the reactor interface. When in use, the electrolytes are transferred between reactor and storage tanks. (706) (CMP-13)
Informational Note:
Three commercially available flow battery technologies are zinc air, zinc bromine, and vanadium redox, sometimes referred to as pumped electrolyte ESS.


Battery, Sealed. (Sealed Battery)

A battery that has no provision for the routine addition of water or electrolyte or for external measurement of electrolyte specific gravity and might contain pressure relief venting. (CMP-13)


Battery, Stationary Standby. (Stationary Standby Battery)

A battery that spends the majority of the time on continuous float charge or in a high state of charge, in readiness for a discharge event. (CMP-13)
Informational Note:
Uninterruptible Power Supply (UPS) batteries are an example that falls under this definition.


Battery-Powered Lighting Units.

Individual unit equipment for backup illumination consisting of a rechargeable battery; a battery-charging means; provisions for one or more lamps mounted on the equipment, or with terminals for remote lamps, or both; and a relaying device arranged to energize the lamps automatically upon failure of the supply to the unit equipment. (517) (CMP-15)
 
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