UL 1989-2013 pdf download – Standby Batteries.
3.6 BATTERY, NICKEL-METAL HYDRIDE STORAGE – An alkaline storage battery in which the positive active material is nickel oxide and the negative contains a metal hydride alloy, and the venting of the products of electrolysis is controlled by a reclosing pressure sensitive valve. 3.7 BATTERY GROUP – A group or family of battery types that exhibit similar physical characteristics with respect to cell chemistry, cell construction, cell structure, and case (enclosure), and that are rated such that all batteries in the group demonstrate equivalent performance characteristics. Batteries belonging to the same group or family differ only in capacity or physical dimensions, or both. 3.8 BATTERY SUPPLY – One or more unitcell or multicell batteries that together supply power to a battery-operated product. A battery supply may consist of a collection of individual and separately replaceable unitcell or multicell batteries in a series and/or parallel array of permanently interconnected and not separately replaceable unitcell or multicell batteries (for example, a ″battery pack″). 3.9 BATTERY SUPPLY ENCLOSURE – A surrounding case or housing used to protect the battery supply and prevent personnel from accidently contacting live parts. The battery supply enclosure may be part of the battery-operated product, or in the case of an external battery supply a separate structure housing the battery supply. 3.1 0 CAPACITY – Generally, the total number of ampere-hours that can be withdrawn from a fully charged battery at a specific discharge rate and electrolyte temperature, and to a specific cutoff voltage. 3.1 1 CELL – The basic electrochemical unit, characterized by an anode and a cathode used to receive, store, and deliver electrical energy. 3.1 2 CHARGE AND DISCHARGE CURRENT (OR RATE) – The rate, in amperes, at which current is delivered to (charge) or by (discharge) a battery expressed in multiples of the value C, which is the rated capacity of the cell or battery in ampere-hours as stated by the manufacturer.