Lithonia Lighting Nickel Cadmium (Nicd) Emergency Lighting Battery Pack in the Emergency Lighting Battery Packs department at Lowes.com
Exitronix 10010037 Battery Pack Replacement for Exit Sign Emergency Li – XML Battery
ETi 60-Watt Equivalent Integrated LED White Exit Sign Emergency Light Combo with Green Letters and Battery Backup (6-Pack) 55502102-6PK - The Home Depot