Check the polarity on the connector to make sure this is a match. 

If it does not match exactly, CUSTOM-306-U might be the battery that is needed.

This item is the high capacity version of our CUSTOM-306, and is still a replacement 9.6 Volt 1000 mAh Nickel Cadmium battery is used in the Lithonia – BBAT0043A Emergency Lighting and meets or exceeds original manufacturer specifications.