What information must be permanently marked on batteries used as a secondary power supply?

What information must be permanently marked on batteries used as a secondary power supply?

• A. Serial Number
• B. Month and Year of Installation
• C. Capacity Rating
• D. Manufacturer's Name

Answer: (B)

Tracking the age of backup batteries is essential for reliability. Batteries used as a secondary power supply have a finite service life, and their ability to deliver full power degrades over time. Permanently marking the month and year of installation gives maintenance staff a clear, ongoing reference to when the battery was put into service, so they can replace it before it reaches the end of its useful life and the system is at risk of failure. While a serial number or manufacturer name might be useful for inventory or identification, and a capacity rating is informative for performance, neither provides the standardized date needed to manage replacement intervals. The month and year of installation directly support timely maintenance and system reliability.

Tracking the age of backup batteries is essential for reliability. Batteries used as a secondary power supply have a finite service life, and their ability to deliver full power degrades over time. Permanently marking the month and year of installation gives maintenance staff a clear, ongoing reference to when the battery was put into service, so they can replace it before it reaches the end of its useful life and the system is at risk of failure.

While a serial number or manufacturer name might be useful for inventory or identification, and a capacity rating is informative for performance, neither provides the standardized date needed to manage replacement intervals. The month and year of installation directly support timely maintenance and system reliability.