ZOLL AED Plus Defibrillator Not Working After Battery Change


The ZOLL AED Plus is an automated external defibrillator (AED) that is designed to analyze heart rhythm and deliver a shock to victims in sudden cardiac arrest. Having a functional AED available can mean the difference between life and death in an emergency. 


However, sometimes issues can arise after the battery in an AED Plus is replaced which prevents the device from working properly.

ZOLL AED Plus Defibrillator Not Working After Battery Change

ZOLL AED Plus Defibrillator Not Working After Battery Change


Here is a guide on troubleshooting a ZOLL AED Plus defibrillator that is not working after a battery change and steps to get it functioning again.

Overview of the ZOLL AED Plus Defibrillator

  • The ZOLL AED Plus utilizes advanced technology to automatically analyze heart rhythm and determine if a shock is needed.
  • It has simple audio and visual prompts to guide the rescuer.
  • The device detects issues with pad connectivity or battery power and alerts the user.
  • Regular maintenance like battery replacement is essential for AEDs to work when needed.

Why the AED Plus May Not Work After Battery Replacement?

There are a few potential reasons why a ZOLL AED Plus defibrillator may not power on or function correctly after the battery has been replaced:


Battery Not Fully Connected

  • The battery may not be fully clicked into place in the battery compartment. If the battery is loose, it will not make a proper connection.

Wrong Battery Type

  • Only use battery models recommended by ZOLL for that specific AED Plus unit. Incorrect batteries can prevent the device from powering up.

Battery Not Charged

  • Always use a newly charged battery for replacement. An uncharged or depleted battery will not allow the AED Plus to turn on.

Faulty Battery

  • In rare cases, a brand new battery may be defective and unable to hold proper charge. This would require the replacement of the battery.

Software Glitch

  • Sometimes replacing the battery can cause a temporary glitch in the AED Plus software. This requires rebooting the device.

Steps to Troubleshoot the AED Plus After Battery Change

Follow these step-by-step instructions to troubleshoot an AED Plus with a blank screen or that won’t turn on after installing a new battery:

1. Verify Battery is Installed Correctly

  • Check that the battery is fully inserted into the battery compartment.
  • It should click firmly into place and not wiggle or jostle loose.
  • Check the connectors to make sure they are clean and undamaged.

2. Confirm the Correct Battery Type

  • Consult the AED Plus user manual to confirm which ZOLL battery models are recommended for your specific AED Plus model.
  • Do not substitute alternate battery brands or types.

3. Inspect Battery and Terminal Contacts

  • Remove the battery and visually inspect for any damage or issues.
  • Check that the metal battery terminal contacts are clean and corrosion-free.
  • Clean gently with alcohol if needed.

4. Charge Battery and Reinstall

  • If the battery was recently replaced, charge the battery externally with a ZOLL charger for a few hours.
  • Then reinstall the fully charged battery into the AED Plus.

5. Reboot AED Plus

  • With the charged battery installed, press and hold the green On/Off button for 5 seconds to reboot the AED Plus.
  • If it still won’t power on, remove the battery, press and hold the shock button for 30 seconds to reset the device, and then reinsert the battery.

6. Replace Battery Again If Needed

  • If the AED Plus still doesn’t turn on, the new replacement battery may be faulty.
  • Switch to another new ZOLL battery of the recommended type for the unit.

7. Contact ZOLL Technical Support

  • If the AED Plus still does not power on after verifying the correct battery placement and type, rebooting the device, and installing a different new battery, contact ZOLL technical support for further troubleshooting.

Preventing Future Issues After Battery Change

To avoid having problems when changing the battery in a ZOLL AED Plus in the future:

  • Set calendar reminders for when battery replacement is due.
  • Always use a newly charged ZOLL replacement battery of the correct model.
  • Follow battery installation instructions carefully.
  • Perform regular maintenance checks of AED according to the user manual.
  • Keep spare charged batteries on hand for quick swapouts when needed.

When to Replace the ZOLL AED Plus Battery?

The battery in a ZOLL AED Plus should be replaced:

  • When the device indicates the battery life remaining has reached 25%.
  • At least every 5 years after installation.
  • After each clinical use.
  • If the AED Plus fails a self-test due to low battery conditions.
  • When the expiration date printed on the battery is reached.

The batteries are lithium manganese dioxide batteries. Only use battery replacements recommended by ZOLL.

Proper Battery Disposal

Once removed from the AED Plus, depleted batteries should be disposed of properly:

  • Cover the battery terminals with electrical tape to prevent accidental short circuits.
  • Follow federal, state, and local regulations for lithium battery disposal.
  • Many battery retailers offer recycling programs for AED batteries.
  • Do not throw depleted AED batteries in the trash.

When to Seek Repair of the AED Plus

Contact ZOLL to arrange return and repair if the AED Plus fails to power on or function after:

  • Installing a fully charged new battery of the correct model.
  • Attempting to reboot the device.
  • Replacing the battery again with an alternate new battery.

Seeking repair is also recommended if the AED Plus shows any warning lights or error codes, emits beeping sounds, has any visible damage, or fails self-tests.

Maintaining ZOLL AED Plus Readiness

To keep the ZOLL AED Plus in optimal condition and ready for use in an emergency:

  • Check the status indicator weekly. Green means OK, and red means service required.
  • Run manual self-tests per the maintenance schedule.
  • Clean the device and pads as needed.
  • Check pad and battery expiration dates.
  • Keep the AED Plus in a climate-controlled environment.
  • Follow all maintenance tasks recommended in the user manual.
  • Notify ZOLL immediately about any issues or malfunctions.

With proper care and maintenance, the ZOLL AED Plus automated external defibrillator will provide many years of reliable service when sudden cardiac arrest strikes.

Staying on top of battery replacement and troubleshooting any post-change issues quickly will help ensure the device is always ready to save lives.


Inside the ZOLL AED Plus Battery Compartment

The battery compartment on the ZOLL AED Plus is located on the back of the device. It holds the single lithium manganese dioxide battery used to power the AED Plus.

Inside the battery compartment you will find:

  • Battery terminals – These gold-plated terminals connect with the terminals on the battery to conduct electricity and power the AED Plus.
  • Battery release latch – This mechanism locks the battery firmly in place and releases it when the latch is slid aside.
  • Battery removal handle – After unlatching the battery, this handle lets you extract the battery from the compartment.
  • Battery alignment guide – The compartment has guides to align the battery terminals properly before insertion.
  • Electrical contacts – These connect the battery to the main circuit board of the AED Plus. Any corrosion here can impede the connection.
  • Foam padding – Padding cushions and insulates the battery inside the compartment.

When changing the battery, take note of these components inside the battery compartment. Ensure contacts are clean, the battery clicks into the latch securely, and no foam padding is obstructing the terminals from connecting with the battery.

ZOLL AED Plus Battery Specifications

The ZOLL AED Plus uses a specific lithium manganese dioxide battery to provide power. Here are the technical specifications:

  • Chemistry: Lithium manganese dioxide (Li/MnO2)
  • Voltage: 12V
  • Capacity: 5.7 amp-hours
  • Lithium content: Approx. 9 grams
  • Shelf life: 5 years from manufacture date
  • Standby life: 4 years minimum
  • Operating temperature: 32°F to 122°F

Only use battery models recommended by ZOLL and rated for the AED Plus. Other batteries may not supply the required voltage and capacity. Avoid low temperatures that could deplete battery life.


The battery contains enough capacity to provide 140 defibrillation shocks or 8 hours of continuous monitoring. Frequent replacement helps ensure sufficient standby power.

Checking Battery Charge Level

The ZOLL AED Plus battery status can be checked in several ways:

  • The status indicator on the front of the device shows green if the battery is charged over 25% or red if below 25%.
  • Connect to the ZOLL PlusTrac AED program manager and check the battery status remotely.
  • Initiate a manual self-test on the AED Plus and listen for a “battery low” voice prompt if the charge is depleted.
  • Check the date of installation on the battery label and replace it after 4 years.
  • Inspect the LED battery life indicator on the front of the device when the unit is on standby.

Monitoring battery charge levels and swapping in fresh batteries before they become depleted helps keep the AED Plus rescue-ready.

Contact ZOLL Support

In the event of any issues getting an AED Plus to function correctly after battery replacement, contact ZOLL Medical Corporation support for troubleshooting:

  • Phone: 1-978-421-9655
  • Email: techsupport@zoll.com
  • Website: http://www.zolldata.com/customer-support/

ZOLL representatives can assist with solving AED Plus problems, determining if repair is needed, clarifying battery usage and maintenance, and answering any other questions regarding the device.



Here are answers to some common questions about the ZOLL AED Plus defibrillator after the battery has been replaced:

How long should the AED Plus take to turn on after a battery change?

  • The AED Plus should power on within seconds of inserting a fully charged battery. Any delay could indicate an issue.

Can I use rechargeable batteries in the AED Plus?

  • No, only use lithium manganese dioxide batteries recommended by ZOLL. Do not use rechargeable batteries.

How often should the batteries in the AED Plus be replaced?

  • ZOLL recommends replacing the batteries every 5 years or after each use. Batteries stored in hot climates may require more frequent replacement.

What error messages might the AED Plus display related to the battery?

  • Error codes like “weak battery” or “battery low” indicate the battery power is too low. “Battery failed” or “battery fault” means the battery is no longer functioning.

Can I power on the AED Plus without a battery installed?

  • No, the battery must be installed for the device to power on and function. The AED Plus cannot operate without a battery.

How do I properly dispose of depleted AED Plus batteries?

  • Follow local regulations. Many retailers recycle lithium batteries. You can also contact ZOLL for battery disposal assistance. Do not throw the batteries in household trash.

Why does the AED Plus beep after a new battery is installed?

  • The device may beep after battery replacement as part of its self-test and to indicate normal function has resumed. Unless error codes appear, the beeping is normal.

How do I reboot the AED Plus manually?

  • Press and hold the green On/Off button for 5 seconds. This reboots the device if needed after battery replacement.

What should I do if replacing the battery does not resolve the issue?

  • If the AED Plus still won’t power on correctly after battery replacement and troubleshooting steps, contact ZOLL technical support for assistance. Do not attempt to use the device.

Following proper battery replacement procedures and troubleshooting any issues immediately helps ensure the ZOLL AED Plus is in optimal operating condition when an emergency occurs. Contact ZOLL support with any questions.

More Useful Fixing Guides:


Having an automated external defibrillator (AED) immediately available when sudden cardiac arrest occurs can dramatically improve survival chances. The ZOLL AED Plus utilizes advanced technology to accurately analyze heart rhythms and deliver lifesaving defibrillation if needed. However, these sophisticated devices rely on a properly functioning battery to operate when seconds count.

Replacing the battery according to the maintenance schedule recommended by ZOLL is essential to keep the AED Plus rescue-ready. However installing an improperly connected, faulty, or discharged battery can result in an AED Plus that does not power on when activated in an emergency.

Following the step-by-step troubleshooting guide on “ZOLL AED Plus Defibrillator Not Working After Battery Change” provided after a battery change but before returning the AED Plus to service can quickly resolve many common issues.


Verifying full battery connection, checking for damage, testing with multiple batteries, and rebooting the device can often get the AED Plus back up and running properly.

Knowing the correct specifications and models of replacement batteries increases the chances of seamless battery swaps without device malfunctions. With routine maintenance and care, the AED Plus provides reliable, life-saving functionality over many years of service. 

Staying informed on proper battery usage, replacement, troubleshooting, and disposal ensures this vital equipment operates optimally when called upon to restore a cardiac arrest victim’s heart rhythm.

Regular practice drills, training on the AED Plus, and vigilance about battery status and replacement intervals will prepare response teams for sudden emergencies where this technology saves lives.

Troubleshoot promptly but thoroughly when issues arise to confirm the AED Plus stands ready to shock within its critical 3-minute response window.


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