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A defibrillator sitting on the wall is only as valuable as the care put into maintaining it. When a sudden cardiac arrest happens, there is no time to discover that your AED has a dead battery, expired pads, or a fault light that nobody noticed. The device needs to work the first time, every time.
The good news is that keeping an AED in peak condition is not complicated. Most modern AEDs are designed to be low-maintenance, but that does not mean no maintenance. There are specific checks, schedules, and records you need to keep in place so that your device is genuinely ready when a life depends on it.
This guide walks you through exactly how to maintain an AED and ensure it is always ready for use, whether you are a small business owner responsible for a single unit on the wall or managing multiple devices across a facility. By the end, you will have a clear, repeatable system that satisfies both common sense and most regulatory requirements.
Step 1: Understand What Your AED Needs to Stay Ready
Before you can maintain something properly, you need to know what it actually requires. For an AED, there are three core components that demand your ongoing attention: the battery, the electrode pads, and the device’s self-diagnostic system.
The Battery: This is the power source that delivers the shock. AED batteries are designed to hold a charge for years in standby mode, but they do not last forever. They have both a standby life and a use life, and either one can expire first depending on your situation.
The Electrode Pads: These are the adhesive pads that attach to the patient’s chest and deliver the shock. They contain a conductive gel that degrades over time, even if the pads have never been used. Once that gel dries out, the pads cannot make proper contact with the skin, which means the device cannot function as intended.
The Self-Diagnostic System: Here is where modern AEDs earn their reputation for being user-friendly. Most units run automatic self-checks on a daily or weekly basis, testing their own battery level, pad connectivity, and internal components. They then communicate the results through a status indicator, typically a light on the front of the device. A green light or a checkmark symbol generally means all is well. A red light, a flashing alert, or an audible beep means something needs attention.
The catch is that different AED models communicate differently. Philips HeartStart, ZOLL, Defibtech, and Lifepak devices each have their own indicator systems, icons, and alert sounds. What looks like a ready signal on one device might mean something different on another.
This is why your first task is straightforward: locate your device manual and read the section on status indicators. If you cannot find a physical copy, search the manufacturer’s website using your model number. Bookmark it. Understanding what your specific device is telling you is the foundation of everything else in this guide.
Tip: Write the meaning of your status indicator light on a small card and tape it inside the AED cabinet. Anyone checking the device will know immediately what they are looking for.
Step 2: Perform a Visual Status Check Weekly and After Any Use
A weekly visual check takes less than two minutes and is the single most reliable way to catch problems before they become emergencies. Think of it as a quick confirmation that the device’s self-diagnostics are doing their job and that nothing has changed physically since the last check.
Here is what to look for each time:
Status Indicator: Confirm the light or indicator shows a ready or OK signal according to your device manual. This is your first and most important checkpoint.
Physical Condition: Look at the device itself. Is the case intact? Is it fully closed and latched? Are there any visible cracks, damage, or signs that the unit has been dropped or tampered with?
Electrode Pads: Check that the pads are still sealed in their packaging, connected to the device if required by your model, and within their expiration date. You should be able to see the expiration date printed on the pad packaging without opening it.
Accessories: Confirm that any accessories stored with the device, such as a rescue mask, gloves, or a razor for chest hair, are still present and in usable condition.
After any actual use or practice use, the rules change. Electrode pads are single-use only. Even if they were applied and removed without a shock being delivered, they must be replaced before the device goes back on the wall. Do not assume they are still good. Replace them the same day.
Documentation is a critical part of this step that many people skip. Keep a simple log sheet near the device or in a nearby binder. Each time you complete a visual check, record the date, your initials, and the result. If everything looked fine, write that. If you replaced something or noticed an issue, note that too. This takes thirty seconds and creates a paper trail that matters for both liability and compliance purposes.
Common pitfall: Assuming the device is fine because nobody has touched it. AED self-checks can fail silently if the unit has a manufacturing fault or if the battery has dropped to a critically low level without triggering a visible alert. Your weekly eyes-on check is a second layer of protection that the device cannot provide for itself.
Step 3: Track and Replace Batteries Before They Expire
AED batteries are not like the batteries in a smoke detector. You cannot just pop in a fresh AA when the low-battery chirp starts. Most AEDs use proprietary battery packs that are specific to the model, and they are designed to last several years in standby mode. That longevity is a feature, but it can also create a false sense of security.
There are two timelines to understand. The standby life is the number of years a battery can remain installed and ready before it needs to be replaced, regardless of whether the device has ever been used. The use life is the number of shocks or minutes of operation the battery can support once the device is activated. Either one can run out first, depending on your situation.
Finding your battery’s expiration date is usually straightforward. Look at the battery itself, which is typically accessible by opening a compartment on the back or side of the device. The expiration date is printed on a label. Some devices also display battery status in a self-test log that you can access through the device’s menu. Your manual will tell you how to read it.
Once you know the expiration date, set a calendar reminder 60 to 90 days in advance. This gives you enough time to order the correct replacement battery without rushing, without paying for expedited shipping, and without leaving your device unmaintained while you wait. Replacement batteries for most consumer-grade AEDs are available from the manufacturer or authorized distributors, and installation is typically a straightforward process that does not require a technician.
If your device displays a low-battery warning at any point before the expiration date, treat it as urgent. A low-battery indicator means the device may not be able to deliver a shock reliably. Replace the battery immediately and do not return the device to service until you have done so.
Tip: Every time you install a new battery, write the new expiration date on your maintenance log and set a fresh calendar reminder right then. Do not wait until your next monthly inspection to record it. Doing it in the moment ensures nothing gets missed.
Step 4: Manage Electrode Pad Expiration and Readiness
Electrode pads are easy to overlook because they sit sealed in their packaging and look perfectly fine from the outside. But looks can be misleading. The conductive gel inside the pads degrades over time due to moisture loss, even when the packaging is intact. Once that gel dries out, the pads cannot make adequate contact with a patient’s skin, which compromises the device’s ability to analyze heart rhythm and deliver an effective shock.
This is why expiration dates on electrode pads are a genuine safety concern, not a formality. The date is printed on the pad packaging and is usually visible without opening the pouch. Make checking this date part of every visual inspection.
When pads expire, replace them immediately. Do not use expired pads as a temporary measure while you wait for new ones to arrive. If the pads are expired, the device is not ready. Order replacements in advance so you are never in that position.
If your facility serves or may serve children, check whether your AED model requires separate pediatric pads or a pediatric key to reduce the energy level for smaller patients. These pediatric accessories also have expiration dates and need to be tracked just like adult pads. If your device supports pediatric use, confirm that the appropriate accessories are present, connected, and within their expiration date every time you perform a check.
Keep a spare set of pads on hand. This is one of the most practical steps you can take. When you replace a set of pads, you want to be able to do it immediately, not leave the device unmaintained for two days while you wait for a delivery. A spare set stored nearby solves that problem entirely.
Pitfall: Storing your AED in an environment with extreme heat or cold can degrade electrode pads faster than the printed expiration date suggests. Direct sunlight, unheated storage rooms in winter, or locations near heat sources like ovens or industrial equipment can all shorten pad life. Your storage environment matters, and we will cover that in more detail in Step 6.
Step 5: Conduct a Formal Monthly Inspection and Log It
The weekly visual check is your first line of defense. The monthly inspection is more thorough, more documented, and more important from a compliance standpoint. Think of it as a structured audit of your entire AED program rather than just a quick look at the status light.
Here is what a complete monthly inspection covers:
Status Indicator Review: Confirm the device is showing a ready signal, just as you do in the weekly check.
Accessories Inventory: Verify that all accessories are present and in usable condition. This typically includes a rescue mask or face shield, disposable gloves, a razor for clearing chest hair, and scissors or trauma shears for cutting clothing. If any item is missing or expired, replace it before closing the log.
Pad and Battery Expiration Review: Record the current expiration dates for both the electrode pads and the battery. Note how far out they are and confirm that calendar reminders are in place for replacements.
Physical and Environmental Check: Look at the cabinet or mounting bracket, the signage around the device, and the surrounding area. Is the device accessible? Is the signage clearly visible? Has anything changed in the environment that could affect the device?
Your monthly log entry should capture: the date, the name of the inspector, the status indicator result, the pad expiration date, the battery expiration date, any accessories checked, and any actions taken. This does not need to be a complicated form. A simple printed sheet or a shared digital document works well.
Documentation matters for two reasons beyond just good habits. First, it protects your business. In the event of an incident, a complete maintenance log demonstrates that you took your responsibility seriously and followed a consistent program. Second, many workplace safety regulations and AED program requirements include documentation as a formal requirement, not just a recommendation.
Assign a specific person or role as your AED coordinator. This is the individual responsible for completing monthly inspections, ordering replacement supplies, and keeping the log current. When the task belongs to everyone, it belongs to no one. A named coordinator ensures accountability.
Some AED management programs, including those available through Respond and Rescue, can help businesses track inspections, expiration dates, and compliance requirements automatically. If you are managing multiple devices or want a more structured system, that kind of support is worth exploring.
Success indicator: At the end of each month, you have a completed log entry with no outstanding issues and no expired components.
Step 6: Store Your AED Correctly and Keep the Location Known
Even a perfectly maintained AED is only useful if it is stored in the right place and people know where to find it. Storage and accessibility are not afterthoughts. They are core parts of AED readiness.
Environmental Conditions: AEDs should be stored at room temperature, away from direct sunlight, moisture, and extreme heat or cold. Avoid placing units in unheated garages, near industrial ovens, in direct sunlight through a window, or in areas prone to humidity. These conditions can degrade both the battery and the electrode pads faster than their rated lifespan, and they can damage the internal electronics of the device itself.
Location and Accessibility: Workplace safety guidance commonly references a response time target of three to five minutes as a benchmark for AED accessibility. In practical terms, this means your device should be reachable from any point in your facility within that window. For larger buildings, that may mean multiple units. For smaller spaces, a single centrally located unit may be sufficient.
Mount the device at a visible height, ideally with clear AED signage above it that can be spotted from a distance. Do not tuck it behind a door, inside a storage room, or in a location that requires someone to search for it.
AED Cabinets: A wall-mounted cabinet protects the device from accidental damage and tampering while keeping it accessible. Many cabinets include an alarm that sounds when the door is opened, which can alert staff when the device is removed and deter unauthorized access. If your cabinet has an alarm, test it periodically to confirm it is functioning.
Awareness: Every person in the building should know where the AED is located. Not just the front desk staff. Not just the safety coordinator. Everyone. Post the AED location on building maps, include it in new employee onboarding, and review it during any safety drills or emergency preparedness sessions. The seconds saved by knowing exactly where to go can be the difference between a good outcome and a tragic one.
Step 7: Register Your AED and Keep Training Current
Maintaining the device is only half of the equation. The other half is making sure the right systems and people are in place to use it effectively when the moment comes.
Register Your AED: Many states and provinces in the US and Canada require AEDs to be registered with local emergency services or a public health authority. Registration means that when someone calls 911 from your location, the dispatcher can inform the caller that an AED is on site and direct them to it. This is a meaningful step that can improve outcomes in a real emergency.
Requirements vary by jurisdiction, so do not assume you are covered. Contact your local EMS agency or check your state or provincial health department website to find out what is required in your area. Registration is typically a simple online process, but it needs to be done and kept current if your contact information or device details change.
Keep Training Current: A maintained device is only effective if someone nearby knows how to use it. AED technology is designed to guide users through the process with voice prompts, but hands-on training builds the confidence and muscle memory that makes a real difference when adrenaline is running high and time is short.
CPR and AED certification is typically valid for two years before renewal is recommended by most training organizations. For businesses, this means scheduling regular group training sessions so that certifications do not quietly expire across your team.
Respond and Rescue offers group and corporate training options designed specifically for workplaces, as well as a training calendar for individuals who need to get certified or recertify. Whether you have a team of five or fifty, building AED training into your regular safety program is one of the most practical investments you can make.
Final check: Confirm your AED is registered with local EMS, your staff certifications are current, and your maintenance log is up to date. When all three are in place, your AED program is genuinely complete.
Putting It All Together
Maintaining an AED is not a one-time task. It is a simple, repeatable system that takes only a few minutes each week and a bit more attention each month. The steps are straightforward: know your device, check it regularly, track expiration dates, log your inspections, store it properly, and make sure your team knows how to use it.
When all of those pieces are in place, you can have genuine confidence that your AED will perform when it matters most. That confidence is not just peace of mind. It is a real-world difference in outcomes for anyone who experiences a cardiac emergency in your space.
If you are setting up an AED program for your business or want to make sure your current setup meets best practices, Respond and Rescue can help. From AED sales and management programs to hands-on CPR and AED certification training, we offer everything you need to build a complete emergency preparedness system.
When a real emergency hits, there is no pause button and no second chances. Get hands-on CPR, First Aid, and AED training that prepares you to act fast and with confidence when it matters most. Find a local class or schedule your on-site training now and leave certified, prepared, and ready to save a life.
