What to Know About Your Emergency and Exit Light Batteries

08 Sep.,2025

 

What to Know About Your Emergency and Exit Light Batteries

    Keeping your emergency and exit lights ready for the worst is an important part of maintaining any building, and conserving the lights' backup batteries are a big part of that job. Doing it effectively, fortunately, is fairly easy once you understand the basics of emergency light batteries.

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Emergency And Exit Light Batteries

    Emergency and exit lights are normally hooked into the electrical system of the building they are attached to, but they have to have a backup source of electricity for when the power turns off. That means having batteries that can go to work when the first source of power cuts out, and which should be able to work for 90 minutes.  To accomplish this, emergency and exit lights can use two types of batteries: nickel-cadmium and sealed lead-acid batteries.

     Nickel-cadmium batteries are a bit of more recent invention and don't require adding any type of liquids. They work by putting a non-conductive layer of material between a bit of nickel and a bit of cadmium. This causes the metals to produce charged ions and, thus, electricity. These are small batteries that can be oriented in any direction and can last longer than lead-acid batteries. However, they are more expensive than lead-acid batteries, don't deal as well with temperature extremes, and need to be completely discharged sometimes, so lead-acid batteries remain popular for emergency lights.

     Sealed lead-acid batteries work by having lead alloy plates immersed in acid in them. As the lead breaks down from the acid, they produce electricity.  Lead-acid batteries are likely what you have if you inherited older light fixtures since these are the oldest type of rechargeable battery around.  Letting sealed lead-acid batteries lose their charge completely damages them and shortens their lifespan. Having them re-cycled regularly conserves them, saving you money.

Testing The Batteries

    It can be difficult to tell if exit lights and emergency light batteries are running low on charge because they will work fine when drawing from the building's electrical system no matter what the state of the backup power supply is. The batteries will also have a surface charge to them even when they are not fully charged, which will allow the lights to stay on for a few seconds after power from the building stops flowing to them. This is why exit lights generally have a button somewhere on their casing that will be marked as the test button. You push on this for 30 seconds, and the light should turn on and stay on for the whole time that you are pushing it. If it dims or cuts out, your battery is in trouble. Just remember to hold the button for the full 30 seconds or you will risk being fooled by the dying gasp of the battery's power.

   Another way of testing your emergency and exit light batteries, which is especially useful if you have a big building with a lot of lights to test, is to locate the switch that sends power to the lights on your circuit breaker and flip it off. This is recommended for the annual 90-minute test. If your lights stay bright for the whole time, then your batteries are in the clear. Having them regularly inspected and re-cycled between your annual tests is a good way to make sure your emergency and exit lights are in good shape for years to come.

What is Emergency Lighting? A Complete Guide for Commercial ...

It’s clear that climate change has reached a point where it can affect people’s daily lives. It has affected society by the increasing number of power outages from coast to coast.

In fact, emergency lighting has become a critical safety feature for many. The power outages from increasingly severe winters and summer storms mean it may be time to check and repair your lighting system.

At LITELUME, our goal is to help educate our end-users on emergency lighting so they can buy with confidence heading into .

Keep reading to learn about emergency lighting systems and how it contributes to a building’s safety.

The Importance of Emergency Lighting

Life is showing signs of getting back to normal, and buildings are beginning to reopen. This means that property managers must ensure the building follows emergency lighting standards.

Whether it’s a residential or commercial property, these systems must follow regulations. Doing so helps keep everyone safe in the event of an emergency like a fire.

The system is in place to provide lighting for a safe escape when the main source of power fails. In these situations, a building without emergency lights can prove fatal to trapped inside.

Some systems wire directly into the main electrical supply. Others integrate a separate power source, like an emergency light battery. This guarantees light even when the main power supply shuts off.

Property managers and owners must conduct routine maintenance on their fixtures. Batteries have a notoriously short lifespan and must be constantly tested. In order to pass the test, batteries must be able to provide light for a minimum of 90 minutes in case of power failure.

Generally, a licensed professional must conduct these tests every six months. However, not all lights use batteries as a power source. The code only states that exit signs must remain illuminated. This means that you can use other sources of illumination like photoluminescence.

Is an Emergency Lighting System Necessary?

Buildings with public access or employees require an emergency lighting system. Some examples include office buildings, hospitals, terminals and places of worship.

Some properties don’t require an emergency lighting system. These are generally privately occupied residences. Essentially, places where the public cannot readily access them.

Types of Emergency Lighting

There are various broad categories of emergency lights. These include self-contained fixtures, central batteries and others named by their specific function.

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Self-Contained

For example, you may come across LED emergency lights, which are self-contained fixtures. These lights come equipped with a built-in recharging circuit and rechargeable batteries.

Self-contained fixtures must remain at or near 100 percent charge. They must also wire directly to the main power supply.

Central Battery

A central battery emergency lighting system operates how it sounds. It delivers power to a central battery using fire-resistant cables. These systems are generally found in larger buildings like offices and hospitals.

These systems are either maintained or non-maintained. An example of a maintained fixture is an exit sign with an emergency light.

Maintained and Non-Maintained Fixtures

Maintained fixtures operate as normal lights but remain lit when there’s a power outage. Another example of this is the large square LED panels found in schools and office buildings.

These panels can operate in emergency situations because of a conversion kit. So when the main power supply is operational, the light can switch on and off. However, it automatically switches on when the main power supply dies.

On the other hand, non-maintained emergency lighting fixtures stay turned off as long as the main power supply is operational. They only turn on in the event of a power outage. The LED bulkheads found installed over doors in stairwells are a perfect example.

Other Types of Emergency Lighting Fixtures

The three other types include escape, standby and high-risk task lighting.

The purpose of escape lighting is to help people safely navigate out of a building in an emergency situation. You’ll find open area lighting fixtures and emergency signage within this type of system.

Open area fixtures serve as a lighting tool to help minimize panic. They also help people to follow their designated escape route. The purpose of emergency signage is to indicate the direction of each escape route. It also guides people by indicating whenever there’s a directional change.

Standby lighting fixtures aren’t a required emergency light source. However, they’re beneficial for situations that cannot experience a power outage. For example, many hospital operating rooms have installed standby lighting fixtures.

High-risk task fixtures serve to light areas where you must not have a power outage. Oftentimes, you’ll find these emergency lighting fixtures used with hazardous tasks.

Benefits of Emergency Lighting

While power outages in the past have been minimal, climate change has increased the odds. There are instances of more buildings experiencing an emergency situation. In addition to safety, these lighting fixtures come with several other key benefits.

The first is somewhat obvious. The most apparent benefit is that emergency lighting acts as a consistent light source. This helps to reduce panic and get everyone out of the building in a safe manner.

They also help reduce wasted time and costs. When there’s a power outage, productivity ultimately declines. The company must also spend potentially thousands in figuring out a solution. Additionally, the installation process is simple, and the fixtures follow fire regulations.

Emergency lights can also serve an economic purpose for commercial buildings and businesses. Some may find their insurance premium drop when installing emergency lights.

Modern emergency lighting fixtures typically use LED technology. This means they have significantly longer lifespans and are much more energy-efficient.

Keeping Your Building Safe – Contact LITELUME Today!

Having an emergency lighting system isn’t enough. Without routine maintenance and checkup by a licensed professional, the system is useless. It’s like purchasing a Porsche and having it sit in your garage collecting dust.

There’s no denying that an emergency lighting system is an investment. The best way to prolong your investment and get the greatest return is to use quality emergency lighting hardware.

The company is the world’s best lithium-ion emergency light power pack supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.