Introduction
Is your ADT motion sensor acting up? A dying battery could leave your home unprotected. Whether you’re a DIY pro, a busy parent, or a security technician, this guide covers everything about ADT motion sensor batteries—how to replace them, spot warning signs, and pick the best replacements for 2025. Let’s keep your security system running smoothly!
What Battery Does an ADT Motion Sensor Use?
Most ADT motion sensors use long-lasting lithium batteries like CR123A or CR2. These batteries are reliable, work in extreme temperatures, and last years.
Common Models & Batteries:
| Sensor Type | Battery | Lifespan |
| Wireless Indoor Sensor | CR123A | 3–5 years |
| Pet-Friendly Sensor | CR123A | 3–5 years |
| Outdoor Pro Sensor | CR2 | 4–6 years |
Pro Tip: Avoid alkaline batteries—they die faster and leak!
How to Replace an ADT Motion Sensor Battery
Tools Needed: New battery, small screwdriver.
- Disarm Your System: Prevent false alarms via the ADT app or keypad.
- Open the Sensor: Slide or unscrew the battery compartment (usually on the back).
- Swap Batteries: Remove the old one, insert the new (match + and – symbols).
- Test: Trigger motion to confirm it works.
Safety Note: Wear gloves to avoid smudging the sensor’s lens.
How Long Do ADT Batteries Last?
- Average Lifespan: 3–5 years (indoors), 2–4 years (outdoors).
- Your battery might drain faster if:
- The sensor is constantly detecting motion (like in busy hallways).
Extreme temperatures, whether hot or cold, can weaken the battery.
Solution: Tweak the sensor sensitivity in the ADT app to conserve power.
How to Know When Your Battery Needs Replacing:
ADT Panel Alerts: You’ll see a “Low Battery” warning on your keypad or app.
Blinking Lights: The sensor’s LED will flash red or yellow.
False Alarms: If the sensor goes off for no reason, that’s a sign.
Dead Sensor: If it doesn’t respond when you test it, it’s time for a change.
Fun Fact: A technician once mentioned that a whopping 80% of “sensor failure” calls are simply due to dead batteries!
Resetting the Sensor After Replacement
- Wait 1 Minute: Let the sensor reboot.
- Press the Test Button: Usually a small hole—use a paperclip.
- Re-Sync with ADT: Follow app prompts or call customer support.
Troubleshooting: If issues persist, reset your entire system via the ADT Control app.
Where to Buy ADT Motion Sensor Batteries
| Retailer | Battery | Price | Link |
| Amazon | CR123A (2-Pack) | $10 | Buy Here |
| Walmart | Energizer CR2 | $9 | Buy Here |
| ADT Store | Official Batteries | $15 | Buy Here |
Budget Hack: Buy in bulk for multi-sensor homes!
FAQs
Nope—they don’t hold up as well and could potentially harm the sensor.
Your sensor will shut down, leaving that area without any monitoring.
Make sure to check for firmware updates or see if the sensor is placed near any heat sources.
Yes! Most sensors are DIY-friendly (no tools needed).
Use lithium—they handle hot summers and freezing winters.
Recycle at stores like Best Buy or Home Depot.
Only if you forget to disarm the system first!
Conclusion
Replacing the battery in your ADT motion sensor is a simple and affordable process that’s crucial to your security. With the proper battery and by following our simple steps, you can avoid security intrusions and annoying false alarms.
Are you ready to get started? Read More Sensor Related Blogs
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