An AED with an expired battery is a wall ornament. Battery state is the second-most-common consumables failure mode after pad expiration, and it has the same cause: nobody set a calendar reminder. The good news is battery cycles are predictable, and the replacement workflow is straightforward.
Battery types by model
| AED | Battery type | Shelf life | Replacement cost |
|---|---|---|---|
| Philips HeartStart OnSite | Lithium primary (M5070A) | 4 years | ~$165 |
| Philips HeartStart FRx | Lithium primary (M5070A) | 4 years | ~$165 |
| ZOLL AED Plus | 10× type 123A lithium | 5 years | ~$110 |
| ZOLL AED 3 | Rechargeable lithium-ion | 5 years | ~$300 |
| LIFEPAK CR2 | Lithium primary | 4 years | ~$200 |
| HeartSine 350P/360P/450P | Combined Pad-Pak | 4 years | ~$120 (combined w/ pads) |
| Cardiac Science G5 | Lithium primary | 4 years | ~$150 |
| Defibtech Lifeline View | Lithium primary | 4 years | ~$100 |
Why ZOLL’s 5-year cycle matters at scale
ZOLL’s 5-year battery cycle, combined with 5-year CPR-D-padz/Uni-padz, means a ZOLL AED Plus or AED 3 can run 5 years between any consumables event if no rescue occurs. For a 10-AED fleet program, this cuts roughly 60% of consumables-tracking labor over 5 years vs Philips’s 2-year pad cycle + 4-year battery cycle.
This is why most enterprise AED fleet programs (healthcare systems, multi-location gyms, school districts with 20+ AEDs) default to ZOLL — the maintenance overhead reduction compounds.
How AEDs verify battery state
Most modern AEDs run automatic self-tests that include a battery voltage check. Cardiac Science’s Rescue Ready® runs the most comprehensive daily check. ZOLL and Philips devices run periodic checks (typically weekly or monthly). A failed battery triggers a visible red indicator on the device.
This does not mean buyers can skip manual inspection. Self-tests verify voltage but cannot predict when the battery will fall below the threshold in the next 30 days. Calendar-driven replacement based on installed date + manufacturer’s shelf life is the correct workflow.
Tracking expiration across a fleet
For 1–4 AED programs: calendar reminders 30 days, 7 days, and 1 day before expiration. Most missed replacements are reminder failures.
For 5+ AED programs: fleet management platforms (ZOLL PlusTrac, AEDTS) automate tracking and alert ahead of expiration. Annual cost typically $75–$150 per AED, offset by avoided expired-battery rescue failures.
Frequently asked questions
How long do AED batteries last?
2–5 years, depending on model. ZOLL AED Plus and AED 3 lead at 5 years.
How much does AED battery replacement cost?
$90–$350 depending on brand. ZOLL AED Plus battery: ~$110. ZOLL AED 3 rechargeable: ~$300.
Will the AED warn me when the battery is low?
Yes. Most AEDs display a visible red indicator and beep when battery voltage falls below a threshold. Don’t rely on this alone — set calendar reminders.
Can I use an AED with an expired battery?
Possibly, briefly, but the device may not deliver therapy correctly. Replace expired batteries immediately.
Do AED batteries need to be recycled?
Yes. Lithium batteries should be recycled via authorized e-waste programs. Most authorized distributors accept battery returns with a new purchase.
How do I install a new AED battery?
Open the device, remove the old battery (typically a single-button release), and insert the new battery in the correct orientation. Most devices run a self-test after battery installation to verify proper operation.
Run the math for your specific facility
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Sources
- Manufacturer specifications — Philips, ZOLL, HeartSine, LIFEPAK, Cardiac Science, Defibtech
- AHA — CPR + AED guidance
Educational content. Pricing reflects 2026 authorized distributor reference points.
