Lithonia Lighting PS1400QD MVOLT M8 Accessory - 13.31" 3W Quick Disconnect Emergency Ballast, Black Finish, Includes Battery Control Module PSBCEB2 Includes Battery Control Module PSBCEB2 Sealed, maintenance-free, high-temperature nickel-cadmium battery Specification-grade emergency ballast operates one or two 4' fluorescent t8 lamps providing 1400 lumens of light output Durable thermoplastic/metal housing resists impact and corrosion Automatic battery recharge after 90-minute discharge