Battery replacement is the common case — sealed lead-acid packs have a defined service life and the unit will fail its 90-minute test when the pack degrades. The pack must match the unit's voltage and capacity, and connectors differ between manufacturers. Remote heads are specified by voltage and wattage. Replacement faces have to match the housing and the lettering color the code allows.
We stock replacement batteries, remote heads, lenses, and exit sign components for the units we sell.