One Beat - AED Help Hub

You can find all the info you need to properly maintain your Philips HeartStart OnSite right here! If you have questions or want to speak to an expert, call us at 855-ONE-BEAT or use our live chat feature.


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This 2 minute video tells you everything you need to know about owning a Philips HeartStart OnSite AED.


A Beeping AED

Your Philips OnSite AED performs regular self-tests to make sure its always rescue ready. If an issue is detected, the unit will let you know with a chirping sound. That beeping sound will come in single chirps or triple chirps. For single chirps, press the blue "i-button" and the device will tell you what the issue is. If you're hearing triple chirps, contact Philips for service.

  • Battery Levels Low Or Expired - check the expiration date on the back of the AED battery to see if the the battery is expired or approaching its expiration date. 
  • Expired Electrode Pads - the adhesive gel on AED pads can dry out over time and become ineffective. Your AED will beep if the electrode pads are nearing their replacement cycle. 
  • Internal Circuitry Problem (Triple Chirp) - if your pads and battery are both good-to-go and your Philips OnSite is still beeping, there could be a problem with the internal circuitry. In this case, you should contact Philips at 1-844-531-6861

When Do I Need To Change My AED Pads?

  • About Every 2 Years - Philips OnSite pads have a 2 years shelf-life, they should be replaced your prior to their expiration date. 
  • Over time the AED pad adhesive dries out and loses its ability to stick to a patient's skin. This means the pads won't be able to monitor heart rhythms or administer defibrillation. 
  • What Do I Do With The Old Pads? - you can throw away your old AED pads in the garbage. 
  • Important Note - avoid drying out the electrode adhesive gel by making sure not to open the hard cover or film seal of the cartridge until you need to use the pads in an emergency.
philips aed replacement pads m5071a

Where Can I Find the expiration date?

  • On the front of the device, below the graphic of the man's chest there is an icon of an hourglass. Next to that hourglass is a date (year/month format). You should have a new set of replacement pads ready before that date arrives. 

How Do I Replace My AED Pads?

Follow these quick steps or view the attached video:

philips aed replacement pads m5071a 

When Do I Need To Change My AED Battery?

  • About Every 4 Years - the Philips OnSite battery lasts 4 years (when installed by the install-by-date). Your OnSite AED will alert you by beeping when the battery level is low and should be replaced. 
  • What Do I Do With The Old Battery? - AED batteries can't be thrown away with your regular trash. Old AED batteries have to be recycled properly. If you have a Best Buy store nearby, you can take the old battery to one of their battery recycling bins found outside of each store. 
philips aed replacement battery m5071a

The Install-By-Date

  • Install-By-Date - there is no expiration date on the Philips OnSite AED battery. It has an install-by-date. As long as your battery is installed before that date you'll get a 4 year standby-life out of that battery. 
  • Recommendation - make sure you write down the date you installed the AED battery, this will let you know ahead of time when you should start ordering a replacement battery. You can write this down on the AED inspection tag that came with your purchase.
  • After You Replace The Battery - your AED will automatically run a self-test when the battery is inserted. Follow the instructions until the end of the self-test, the AED will go into standby mode and the green Ready light will blink letting you know your device is ready for rescue.

How Do I Replace My AED Battery?

Follow these quick steps or view the attached video:

Philips OnSite AED battery replacement

About Your AED Accessories

Adult SMART Pads - the adult SMART Pads are only compatible with the Philips OnSite AED. These must be replaced every 2 years or after-use. Places with high traffic may want to consider having a spare set of adult pads with their AED. 

Infant SMART Pads - just like the Adult version, these pads need to be replaced every two years. Locations like schools or camps that regularly see a lot of children should absolutely have a set of infant pads with their AED. We recommend installing the infant pads as the primary cartridge on your AED for faster response. 

Training Pads - your Philips OnSite device can be used for AED training with a pair of training pads. The training pads are non-shocking and reusable. If you do use your device for training, we recommend storing the training pads and AED separately to avoid using the wrong set of pads during a real emergency. 

Lithium Battery - must be replaced around every 4 years. Your old battery needs to be properly recycled. We recommend taking it to the battery recycle bin found outside local electronics stores like Best Buy. 

First Aid / Bleeding Control Kit - pairing your AED with a first aid/bleeding control kit is a great way to boost your emergency safety coverage. 



  • Keep Pads & Battery Installed - Always store your OnSite with the pads cartridge and battery installed. This will keep your device ready for an emergency and will allow your device to perform daily self-tests.
  • Training Pads Separate - if you have training pads, store them separately from your emergency defibrillator to avoid accidentally using them during an event. 
  • After An Emergency - after an emergency, insert new pads and make sure your AED is ready for use before returning it to service.
  • Philips Accessories  - your Philips OnSite AED is only designed to be used with official Philips-approved accessories, it might not function properly if non-approved accessories are used. 
  • And Remember - each step in the maintenance process is crucial to giving victim's the best chance of survival possible. For every minute a cardiac arrest victim goes without treatment, their chance of survival decreases by up to 10%. Preparation now, can save lives later.

Replacement Accessories

Everyone owning a Philips HeartStart OnSite AED is going to need to replace their electrode pads and battery. Depending on where your AED is going to be located, you might need additional accessories. 

Philips Heartstart onsite infant child pediatric smart pads cartridge M5072A

Shop Infant SMART Pads

philips aed battery M5070A

Philips AED Battery

philips heartstart onsite replacement carry case

Replacement Case

Philips HeartStart OnSite training pads cartridge M5703A

Training Pads

philips heartstart onsite trainer M5085A

Philips Trainer

AED fast response kit

Fast Response Kit

bleeding control kit

Bleeding Control Kit


Need CPR & AED Training? We've Got You Covered

For over 20 years, One Beat has provided affordable, high quality CPR training solutions to people all across the country. We work to offer custom solutions that fit you or your organization's specific needs!

  • Group training at your location, nationwide
  • Get certified at one of our South Florida facilities
  • Affordable online training solutions
  • American Heart Association CPR Certifications 

To book a class, talk to a training specialist, or learn more about our training program, click here!