Recharging batteries must be completed within how long after a single discharge has occurred?

Recharging batteries must be completed within how long after a single discharge has occurred?

• A. 24 hours
• B. 48 hours
• C. 72 hours
• D. 96 hours

Answer: (B)

Recharge backup batteries promptly after a discharge to keep the fire alarm system ready and to protect the battery from damage. Returning the battery to full charge within 48 hours helps prevent sulfation and capacity loss that can occur when a lead-acid cell sits discharged for too long. This timeframe balances practicality with reliability: it reduces the risk of permanent degradation while allowing normal recharging steps and maintenance checks to be completed. Using a proper charger and monitoring the state of charge ensures you bring the battery back to its rated capacity without overcharging. Waiting longer than 48 hours increases the chance that the battery won’t perform as needed during a future outage.

Recharge backup batteries promptly after a discharge to keep the fire alarm system ready and to protect the battery from damage. Returning the battery to full charge within 48 hours helps prevent sulfation and capacity loss that can occur when a lead-acid cell sits discharged for too long. This timeframe balances practicality with reliability: it reduces the risk of permanent degradation while allowing normal recharging steps and maintenance checks to be completed. Using a proper charger and monitoring the state of charge ensures you bring the battery back to its rated capacity without overcharging. Waiting longer than 48 hours increases the chance that the battery won’t perform as needed during a future outage.