Battery RequirementsVented Lead-Acid BatteryValve Regulated Sealed Battery System Vrla BatteryBattery RackValve Regulated BatteriesVented Lead-Acid and Nickel-Cadmium BatteriesBattery AccessoriesBattery Charger ConstructionBattery Charger DesignControls and Meters Racks shall be constructed of welded structural steel frames with bolted steel.All metallic rack components that are in contact with the battery shall be insulated by removable covers.Racks for nickel-cadmium batteries shall be coated with an alkali-resistant plastic coating.See more on paktechpoint Wikipedia
Nickel–cadmium battery - Wikipedia
Large nickel-plated copper studs and thick interconnecting links assure minimum equivalent series resistance for the battery. The venting of gases means that the