How must batteries be labeled?

• A. With the date they were installed
• B. With the expiration date
• C. With the model number
• D. Must be labeled with the date they were installed

Answer: (D)

Tracking how long a battery has been in use is the core idea. In alarm systems, batteries should be labeled with the date they were installed so technicians can quickly determine the age and schedule timely replacement, preserving system reliability and safety.

Expiration dates aren’t the standard requirement because a battery’s useful life depends on how it’s used and maintained, and the installation date provides a consistent reference point for replacement planning. The model number helps identify the type, but it doesn’t indicate how long that specific battery will last in service. Labeling by installation date directly supports ongoing operation and compliance with maintenance intervals.