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The Schlage Electronics 900-BBK batter backup kit connects to a Schlage Electronics PS900 Series power supply to provide emergency power to a door access system in case of power disruption. The kit includes a battery backup board and a battery pack that provides up to four hours of backup power when cycled every 5 minutes at full load. The battery pack contains two batteries that each have a 7 amp-hour rating. Schlage Electronics, an Allegion brand, manufactures security products for commercial and residential use. Allegion is headquartered in Carmel, IN.