Emmerich 48d4000s emergency lights battery 4 8v 4000mah emmerich 48d4000s p the emmerich 48d4000s is an emergency lights battery rated at 4 8v 4000mah this nickel cadmium nicd battery pack is ideal for escape route lighting security and emergency lighting the battery has a 4x in line battery configuration and is both universal and suitable for use in most brands of emergency lighting p emmerich 48d4000s emergency lights battery 4 8v 4000mah