Lead-acid batteries used in fire alarm systems require charger testing frequency?

• A. Weekly
• B. Monthly
• C. Annually
• D. Daily

Answer: (C)

When maintaining fire alarm systems, the charging equipment for the backup lead‑acid battery is checked on a less frequent, but thorough, basis. The key idea is that the reliability of the standby power source is verified through an annual discharge test to confirm the battery can deliver the required current for the system’s duration, and the charger is functioning properly enough to keep the battery ready. Lead‑acid standby batteries have a long life, so a comprehensive test that checks capacity and charger performance is typically performed once a year, aligning with manufacturer guidelines and maintenance cycles. Daily or weekly checks focus on general system operation, while monthly checks aren’t necessary for charger verification. Annual testing provides a balanced, code‑aligned approach to ensuring readiness without unnecessary disruption.