A typical automated external defibrillator (AED) lasts 8 to 10 years before the manufacturer recommends replacing the unit. But the device itself is only part of the picture. Batteries and electrode pads have much shorter lifespans, and keeping track of both is what determines whether your AED will actually work in an emergency.
How Long the AED Unit Itself Lasts
Most AED units have a service life of roughly 8 to 10 years. After that point, manufacturers generally stop supporting the device with software updates and compatible accessories, and internal components may degrade beyond reliable use. Some models continue functioning past that window, but replacement batteries and pads can become difficult to source for discontinued units.
The FDA requires premarket approval for all AEDs and their accessories, including batteries and electrode pads. If your AED model is older and no longer listed among FDA-approved devices, it’s worth contacting the manufacturer to confirm whether it’s still supported. Using non-approved accessories with an older unit can compromise reliability.
AED Battery Life by Brand
Batteries are the component most likely to need replacing during the life of your AED. Standby battery life, meaning how long the battery lasts while the AED sits in its cabinet waiting to be used, varies significantly by brand and model.
- Philips HeartStart OnSite and FRx: about 4 years installed, 5 years if stored uninstalled
- Philips HeartStart FR3: 4 to 5 years installed
- Zoll AED Plus: 5 years installed on newer firmware, only 3 years on older firmware versions, and up to 10 years uninstalled
- Zoll AED Pro: about 5 years installed
- Stryker LifePak CR Plus: about 2 years
- Stryker LifePak CR2: about 4 years
- Stryker LifePak 1000: about 5 years with the non-rechargeable option
These numbers assume normal standby conditions. The battery slowly discharges over time as the AED runs periodic self-checks, which is why installed batteries don’t last as long as uninstalled ones. If your AED has been sitting in a cabinet for three or four years, check the battery status indicator. Most devices have a light or display that tells you whether the battery is still good.
Shock Capacity
Battery life isn’t only measured in years. It also matters how many shocks a battery can deliver once it’s in use. A non-rechargeable battery for the Stryker LifePak 1000, for example, can typically deliver around 440 shocks at standard energy levels, or roughly 1,030 minutes of total operating time. The rechargeable version provides about 261 shocks or 608 minutes. In a real emergency, you’d use a handful of shocks at most, so a battery within its expiration window has more than enough capacity for the situation.
How Long Electrode Pads Last
Electrode pads have the shortest lifespan of any AED component, typically lasting 18 to 30 months before they expire. The pads come sealed in a foil pouch with a conductive gel already applied to the adhesive surface. Over time, that gel dries out and its chemical composition breaks down, even inside the sealed packaging. Expired pads may not stick properly to the chest or may fail to conduct the electrical signal effectively, both of which can make the AED useless when it matters most.
Most AED cabinets or cases have a visible spot to write the pad expiration date. If you’re responsible for maintaining an AED at a workplace, gym, or school, checking the pad expiration every few months is one of the simplest and most important things you can do. Replacement pads typically cost between $20 and $70 depending on the brand.
How Storage Conditions Affect Lifespan
Where you store your AED has a real impact on how long its battery and pads last. The ideal storage temperature for most AEDs falls between 50°F and 86°F (10°C to 30°C). Storing a unit in a location that regularly exceeds those limits, like an unheated outdoor cabinet in winter or a metal shed in summer, accelerates battery degradation and can dry out electrode pad gel faster than expected.
If your AED lives in a location with temperature swings, consider a heated or climate-controlled cabinet. These are common at outdoor installations like sports fields and pool areas. Even without a specialized cabinet, moving the AED to an indoor wall mount can add meaningful life to both the battery and pads.
A Simple Maintenance Schedule
AEDs are designed to require minimal upkeep, but “minimal” doesn’t mean “none.” A practical schedule looks like this:
- Monthly: Glance at the status indicator light. A green light or checkmark means the device has passed its self-test. A red light or flashing icon means something needs attention.
- Every 18 to 30 months: Replace electrode pads before they expire. Mark the new expiration date somewhere visible.
- Every 2 to 5 years: Replace the battery, depending on your specific model’s standby life.
- Every 8 to 10 years: Plan to replace the entire unit, or confirm with the manufacturer that your model is still supported and that approved accessories remain available.
Most AED manufacturers and third-party services offer program management that sends you reminders when pads or batteries are approaching expiration. If you manage multiple AEDs across a building or organization, these tracking programs can prevent the kind of quiet neglect that leaves a device non-functional for months without anyone noticing.