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How to Change the Battery in an ADT Alarm System

This article is a collaborative effort, crafted and edited by a team of dedicated professionals.

Contributors: Muhammad Baballe Ahmad, Mehmet Cavas, Sudhir Chitnis, and Zhen-ya Liu.

✓ Verified & Tested Information

This blog post will show you how to change the battery in your ADT alarm system.


Before attempting to change the battery in an ADT alarm system , there are a few steps you will need to take in order to ensure you are prepared for the job. Firstly, you will need to purchase a new battery for your system. You want to make sure the battery you purchase is compatible with the model of your system. Additionally, you will need to disconnect the power source to the system and make sure to wear protective gear such as gloves and safety glasses while handling the old battery. After gathering all the necessary materials, you can start the battery changing process.

Gather necessary tools and materials

To change the battery in your home’s ADT alarm system, you will need a few basic tools and materials. Gather the following items before you start:
-A Phillips head screwdriver
-A new 9V battery
-The plastic screwdriver that came with your ADT panel (if it included one)
-Step ladder or stool (if necessary)

In addition to the materials listed above, make sure you have access to a flashlight and/or work light if needed for your particular location. When going out to purchase a new battery, check the current size of the old one and buy an identical replacement. Avoid buying general use batteries for best results. Once you have the necessary items ready, you can begin changing your alarm system’s battery.

Identify the type of battery needed

Changing the battery in your home alarm system can be a daunting task. It is essential to identify the type of battery needed to ensure that your system runs smoothly and remains fully functional. ADT alarm systems usually have a rechargeable lithium-ion battery, but sometimes they use lead-acid batteries instead.

Rechargeable lithium-ion batteries are often more expensive, but they last longer and are rechargeable which can save you money in the long run. Lead-acid batteries are generally cheaper but will need replacing more frequently so it is worth considering which type would be best for you before you make a purchase.

It’s also important to check the model compatibility of any replacement batteries you get for your alarm system when ordering products from different suppliers or websites. Make sure the replacement battery matches the model specifications recommended by ADT on their website – different models may require varying types and sizes of replacement batteries so this is an important step when shopping for replacements.

Locate the Battery

Before you begin replacing the battery in your ADT alarm system, it is important to locate the battery. It is typically located on the main control panel of your system, but the exact location can sometimes vary. If you are unfamiliar with the layout of your system, you can consult the user manual. Knowing exactly where the battery is located will make the battery replacement process easier and more efficient.

Identify the main alarm panel

ADT alarm systems work with a main alarm panel connected to keypads installed in each room of your home or commercial property. Locate the main alarm panel; it is typically mounted near the entry way and has a backup battery inside. A backup battery supplies power when the main power source fails and helps prevent interruption of monitoring service by ADT security. In order to change out the battery, the cover of the main alarm panel must first be removed.

Locate the battery compartment

In most ADT alarm systems, the battery is an integral part of the control panel. Before you attempt to replace your battery, it is important that you locate the correct compartment. In most cases, this will be either on the side or at the back of your panel. Make sure that you take note of the type of battery and where it is kept; this information will help you purchase a replacement when needed. If your system has a backup battery, it may be stored in a separate compartment separate from the main unit; this will usually be located near or at the base of your main control panel. A small yellow warning sticker may help identify where your backup battery can be found.

Remove the Old Battery

It is important to know how to maintain your ADT alarm system to ensure that it works properly and efficiently. One of the main components of an ADT alarm system is the battery, which needs to be changed periodically. Replacing the battery takes a few important steps. This section will explain how to remove the old battery from your ADT alarm system.

Disconnect the power

It is critical to turn off the power before attempting to change the battery in an ADT alarm system. This can be done by disconnecting the transformer-which is typically located behind the user control panel-from both the power source (such as a wall socket) and from the outlet connected to the alarm system. Once disconnected, press and hold down the RESET button for at least 15 seconds. This will reset all of your settings, including any wireless sensors and other accessories that you may have set up.

If this does not work or you encounter any difficulties, such as blinking or solid red LEDs on your user control panel, contact your local ADT office or Customer Care immediately for assistance with resetting and powering down your system so you can properly remove and replace its battery.

Unscrew the battery compartment

Before attempting to replace the battery in your ADT alarm system, you must first locate and remove the current battery. The battery compartment is typically located at the bottom of the alarm control panel and it is secured by a set of screws. Use an appropriate screwdriver to unscrew the battery compartment until it can be easily removed. Place all screws in a safe location, ensuring they are not lost during this process. Carefully remove the faulty old battery and discard it safely according to local hazardous material regulations.

Remove the old battery

Before you can replace the old battery in your ADT alarm system, you must first remove it from the unit. Doing so is fairly straightforward, but there are a few steps to follow in order to do it safely and correctly.

Before attempting any work on the unit, make sure that your system is completely disconnected from any power source. Once this is done, start by locating the battery compartment. It is typically found near the AC transformer on the main alarm system mount or control panel. It may have a clip closure or a simple screw to open it up.

Once you have access to the battery compartment, gently pull out and disconnect any wires that are connected to it. Be careful not to damage or tear them as they will need to be replaced once you install the new battery later on.

Next, gently lift out the old battery and set it aside for safe disposal in an environmental-friendly manner after its removal is complete. Now you have removed your old battery and are ready for replacing with a new one!

Install the New Battery

Installing a new battery in your ADT alarm system is an important step in ensuring that your system is functioning properly. The process involves replacing the old battery with a compatible new one of the same voltage and amperage. By following the proper steps, you will be able to install the new battery without any issues. Let’s go through the process of replacing the battery in an ADT alarm system together.

Insert the new battery

After the old battery has been removed, it is time to install the new one. Place the new battery in the same location as the old one and ensure that it is securely and firmly seated. To ensure a good connection, gently wiggle each terminal of the battery to make sure it is properly seated. Carefully double check your connections before proceeding.

Once confirmed, replace the metal lid and make sure it is properly attached to avoid tripping an alarm or short circuit of your system short-circuiting in case of a power failure. It is important to check that there are no gaps or cracks between the casing and lid- otherwise water can enter and cause damage over time. Finally, secure any exposed wiring with electrical tape before replacing panels on either side of the control unit once more.

Secure the battery compartment

Once the new battery has been successfully installed in the panel, you can secure the battery compartment. Reattach the red and black wires to their respective terminals, following the same steps for disconnecting them. Then, reinstall the plastic screws that hold down each terminal block. Finally, reattach and secure the panel case by replacing all of the screws removed during battery installation. Make sure your new battery is firmly connected before you turn on your alarm system – an improperly installed battery may cause malfunctions in your alarm system’s operation.

Test the Alarm System

Testing the alarm system after a battery replacement is an essential part of the process. This will ensure that the alarm system is functioning correctly with the new battery installed. Testing the alarm system can be done in a few simple steps, and should be done after each battery change. Let’s review the steps to test the alarm system.

Reconnect the power

Once the batteries have been replaced in your ADT alarm system, it’s time to reconnect the power. This can be done by simply plugging your alarm system back into its power source. Make sure you plug it in according to polarized directions – with one side going in first and then the other. After the power is restored, your alarm will begin to communicate with ADT monitoring centers once again, ensuring secure and continuous protection for your home or business. Depending on which type of system you have, there may a sequence of LED lights that will turn on indicating that it is receiving power again. If more than one LED turns on but does not remain on for more than 15 seconds, this usually means that there may be a wiring problem or insufficient battery voltage which need to be addressed.

Test the alarm system

Testing your ADT alarm system regularly is an important habit to ensure that it is functioning properly. Before you can test your system, you need to make sure the battery is in good condition. A low/dead battery will cause the system to malfunction, so it’s important to replace it if needed. Once the battery has been changed, follow these steps to test your alarm system:

1. Start by entering your user code and pressing the “Off” button on your alarm’s keypad. This will turn off any existing alarms that may have been set accidentally or erroneously triggered.

2. Next, Test all of your sensors – door contacts and motion detectors – with a simple function test from each sensor and make sure all parts are communicating properly back to the alarm panel or keypad unit.

3. Finally, press the “Test” button on your keypad for about 15 seconds before releasing it; this will activate an audible siren throughout your home or business and confirm that your system is working correctly across all components.

Testing your ADT Alarm System regularly is crucial in helping identify any potential problems and maintaining peace of mind when it comes to protecting yourself, family members/employees, and property from intrusion or damage.

How to Change the Battery in an ADT Alarm SystemCheckout this video:

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