Why Emergency Lights Fail: The Hidden Battery Issue

Key Factors Behind Emergency Light Battery Degradation

Several factors influence how long a battery lasts in emergency and exit lighting systems. Here’s a breakdown of the most important contributors:

• Age: Batteries naturally lose capacity over time due to calendar degradation. High temperatures and low-charge storage conditions accelerate this process.

• Initial Energy Capacity: Batteries with higher initial capacity can maintain the required 90-minute emergency discharge for a longer period.

• Rated Cycle Count: Emergency lights are only discharged during scheduled maintenance, typically twice a year. This makes cycle life less critical than for consumer electronics.

What Types of Batteries Are Used in Emergency Lights?

Emergency lighting has progressed through several generations of battery technology:

• Lead-Acid (Pb): Early systems used bulky, inefficient batteries that required frequent replacement.

• Nickel-Cadmium (Ni-Cd): Better suited for high temperatures, but environmentally harmful due to cadmium content. Lifespan: 2–4 years.

• Nickel-Metal Hydride (Ni-MH): Improved capacity and environmental performance. Typical lifespan: 3–5 years.

• Lithium Iron Phosphate (LiFePO₄): Current standard. Offers high stability, long life (5–12 years), and excellent recyclability.

How Long Do Emergency Light Batteries Last?

Modern LiFePO₄ emergency light batteries usually last between 5 and 12 years. To optimize battery lifespan:

• Maintain ambient temperature between 20°C and 25°C

• Choose lights with single-cell designs to avoid system failure from one defective cell

• Consider battery capacity during product selection

Repairing vs. Replacing Emergency Lights

Historically, failed emergency lights were replaced entirely. However, in many cases, only the battery needs replacement — a cost-effective and eco-friendly solution.

How to Replace Emergency and Exit Light Batteries

According to AS/NZS 2293.3:2018 Section 4.9b, emergency lights must clearly display battery replacement information.

Usually printed on the battery itself, this model number can help you find compatible replacements online or through electrical wholesalers.

Proper Disposal of Old Emergency Light Batteries

Used batteries should never be discarded with general waste. Instead:

• Take them to a certified battery recycling facility

• Ensure proper handling to recover valuable materials and prevent environmental harm

Conclusion

Choosing the right emergency lighting technology is critical for building safety and long-term maintenance efficiency. With innovations in LED and battery design, modern emergency lights offer greater reliability and environmental responsibility.

For maximum performance and peace of mind, choose Godson emergency lights — the new benchmark in emergency lighting solutions.