UL 1989 STANDARD FOR SAFETY Standby Batteries

BATTERY, LEAD ACID:
a) VALVE REGULATED – A storage battery, the electrodes of which are made of lead (negative electrode) and lead dioxide (postive electrode) and the electrolyte consists of a solution of sulfuric acid in which the venting of the products of electrolysis is controlled by a reclosing pressure-sensitive valve. These batteries have commonly been referred to as maintenance-free, starved electrolyte.
b) VENTED – A storage battery the electrodes of which are made of lead and the electrolyte consists of a solution of sulfuric acid in which the products of electrolysis and evaporation are allowed to escape freely to the atmosphere. T hese batteries have commonly been referred to as flooded or wet.

BATTERY, NICKEL-CADMIUM STORAGE:
a) VALVE REGUL ATED – An alkaline storage battery in which the positive active material is nickel oxide and the negative contains cadmium and the venting of the products of electrolysis is controlled by a reclosing pressure sensitive valve.
b) VENTED – An alkaline storage battery in which the positive active material is nickel oxide and the negative conlains cadmiurm and the producls of electrolysis and evaporation are allowed to escape freely to the atmosphere. These batteries are commonly referred to as flooded.

LISUN following instruments fully meet UL 1989 STANDARD FOR SAFETY Standby Batteries:

SMT-B535 The UL 1989 UL 1418 Impact Test Ball is a 2-inch steel sphere that weighs 535 grams.