How to Change Battery in Eufy Smart Lock

Changing the battery in your Eufy smart lock is quick and simple with the right tools and steps. This guide walks you through the entire process—from checking battery levels to testing the new battery—so your lock stays secure and functional.

Key Takeaways

• Check battery levels regularly: Use the EufySecurity app to monitor battery status and avoid unexpected lockouts.
• Use high-quality alkaline batteries: Replace with 4 AA alkaline batteries (1.5V each) for optimal performance and longer life.
• Power down before replacing: Always turn off the lock via the app or physical switch to prevent electrical issues.
• Follow the correct removal sequence: Remove the battery cover, take out old batteries, and insert new ones with proper polarity.
• Test the lock after replacement: Ensure the lock responds to app commands, keypad, and manual operation.
• Keep spare batteries on hand: Store extras in a dry, cool place to avoid being caught unprepared.
• Contact support if issues persist: If the lock doesn’t work after battery replacement, reach out to Eufy customer support for help.

How to Change Battery in Eufy Smart Lock

If you own a Eufy smart lock, you already know how convenient it is to unlock your door with a tap on your phone, a PIN code, or even your fingerprint. But like any electronic device, it runs on batteries—and when those run low, your smart lock can stop working at the worst possible moment. That’s why knowing how to change the battery in your Eufy smart lock is essential for maintaining security and convenience.

In this comprehensive guide, we’ll walk you through every step of the battery replacement process. Whether you have the Eufy Smart Lock Touch, Smart Lock Video, or another model in the Eufy lineup, the steps are similar. We’ll cover how to check your battery level, prepare for replacement, safely remove the old batteries, install new ones, and test the lock to ensure everything works perfectly.

By the end of this guide, you’ll feel confident handling battery changes on your own—no need to call a technician or worry about being locked out. Plus, we’ll share practical tips to extend battery life and troubleshoot common issues. Let’s get started!

Why Battery Maintenance Matters for Your Eufy Smart Lock

Your Eufy smart lock is more than just a door lock—it’s a smart home security device that protects your home and family. It connects to your Wi-Fi, responds to voice commands, logs entry attempts, and sends alerts to your phone. All of this functionality relies on a steady power supply from its internal batteries.

When the battery runs low, your lock may start acting up. You might notice delayed responses, failed app connections, or even a complete shutdown. In worst-case scenarios, the lock could stop working entirely, leaving you locked out—especially if you don’t have a physical key as a backup.

Regular battery maintenance helps prevent these problems. Most Eufy smart locks use four AA alkaline batteries, which typically last 6 to 12 months depending on usage. High-traffic doors (like front entrances) or extreme temperatures can drain batteries faster.

By learning how to change the battery in your Eufy smart lock, you take control of your home’s security. It’s a simple task that takes less than 10 minutes but can save you from stress, inconvenience, and potential safety risks.

Tools and Materials You’ll Need

Before you begin, gather the following items to ensure a smooth battery replacement:

• Four AA alkaline batteries (1.5V): Always use high-quality alkaline batteries for best performance. Avoid rechargeable or lithium batteries unless specified by Eufy.
• A clean, dry cloth: To wipe down the battery compartment and remove dust or debris.
• A small flashlight (optional): Helps you see inside the battery compartment, especially in low-light areas.
• Your smartphone with the EufySecurity app: To check battery status and control the lock during the process.
• A flathead screwdriver (if needed): Some models may require a screw to remove the battery cover.

Having these items ready will make the process faster and reduce the chance of mistakes. Always work in a well-lit area and avoid touching the battery contacts with wet hands.

Step 1: Check the Battery Level in the EufySecurity App

The first step in changing your Eufy smart lock battery is to confirm that it actually needs replacing. Don’t wait until the lock stops working—proactive monitoring helps you avoid emergencies.

Open the EufySecurity App

Launch the EufySecurity app on your smartphone. Make sure your phone is connected to the same Wi-Fi network as your smart lock. If you’ve enabled Bluetooth, the app may also connect directly to the lock for faster access.

Navigate to Your Smart Lock

Tap on the “Devices” tab at the bottom of the screen. Find your Eufy smart lock in the list of connected devices. Tap on it to open the device control panel.

Check the Battery Status

Look for the battery icon or percentage indicator, usually located near the top of the screen. The app will show one of the following:

• Green or 75–100%: Battery is healthy. No need to replace yet.
• Yellow or 25–74%: Battery is low. Consider replacing soon.
• Red or below 25%: Battery is critically low. Replace immediately.

If the app shows a red battery icon or sends a low-battery notification, it’s time to change the batteries. Even if the lock still works, replacing them now prevents future issues.

Enable Low-Battery Alerts (Optional)

To avoid surprises, make sure low-battery notifications are enabled. Go to the device settings in the app, find “Notifications,” and toggle on “Low Battery Alert.” This way, you’ll get a push notification when the battery drops below a certain level.

Step 2: Prepare for Battery Replacement

Once you’ve confirmed the battery is low, it’s time to prepare for replacement. Taking a few precautions ensures a safe and smooth process.

Turn Off the Smart Lock (If Possible)

Some Eufy smart locks have a physical power switch or can be disabled via the app. If your model supports it, turn off the lock before removing the batteries. This prevents electrical surges or accidental lock commands during the swap.

To disable via the app:

1. Open the EufySecurity app.
2. Go to your smart lock’s settings.
3. Look for “Power Off” or “Disable Lock” and tap it.

Note: Not all models have this feature. If yours doesn’t, proceed with caution.

Ensure the Door is Unlocked

Before removing the batteries, make sure the door is in the unlocked position. If the lock loses power while the door is locked, you might not be able to open it from the inside—especially if you don’t have a physical key.

Use the app, keypad, or fingerprint scanner to unlock the door. If you’re near the door, you can also use the manual thumb turn on the interior side.

Gather Your Tools and Batteries

Place your new AA batteries, cloth, and any tools on a clean surface near the lock. This prevents you from having to walk away mid-process, which could lead to mistakes or lost parts.

Wear Dry Gloves (Optional)

If you’re concerned about static electricity or cleanliness, wear dry cotton gloves. This protects both the batteries and the lock’s internal components.

Step 3: Locate the Battery Compartment

The battery compartment is usually located on the interior (inside) side of the smart lock. This is the part of the lock that mounts to the door and contains the manual thumb turn.

Identify the Battery Cover

Look for a small rectangular or square panel on the bottom or side of the interior lock unit. It’s often labeled “Battery” or marked with a battery icon. The cover may be held in place by clips, screws, or a sliding mechanism.

Remove the Battery Cover

Depending on your Eufy model, the cover may be removed in one of the following ways:

• Snap-on cover: Gently press the sides or bottom of the cover and pull it away from the lock. Use your fingernails or a flat tool if needed.
• Screw-secured cover: Use a small flathead screwdriver to remove the screw, then lift off the cover.
• Sliding cover: Slide the cover downward or sideways until it releases.

Be careful not to force the cover. If it doesn’t come off easily, double-check for hidden clips or screws.

Inspect the Compartment

Once the cover is off, look inside the battery compartment. You should see four AA battery slots arranged in a row or square pattern. Check for any signs of corrosion, leakage, or debris. If you see white or green powder (a sign of battery leakage), clean it gently with a dry cloth before proceeding.

Step 4: Remove the Old Batteries

Now it’s time to take out the old batteries. Handle them carefully to avoid damage or contamination.

Note the Battery Orientation

Before removing the batteries, take a quick photo or mentally note how they’re positioned. Most Eufy locks use a standard +/– arrangement, but it’s easy to mix them up if you’re not paying attention.

The positive (+) end of each battery should face the spring or marked “+” terminal in the compartment. The negative (–) end goes toward the flat contact.

Remove One Battery at a Time

To avoid confusion, remove and replace one battery at a time. This reduces the risk of inserting the new batteries incorrectly.

Use your fingers to gently push the battery out from the positive end. If it’s stuck, use a non-metal tool (like a plastic spudger) to pry it loose. Never use metal tools, as they can scratch or damage the contacts.

Dispose of Old Batteries Properly

Place the old batteries in a designated recycling container. Do not throw them in the regular trash, as they contain harmful chemicals. Many hardware stores and recycling centers accept used alkaline batteries.

Step 5: Insert the New Batteries

With the old batteries removed, it’s time to install the new ones. This step is critical—incorrect installation can prevent the lock from working.

Check the New Batteries

Inspect each new AA battery for damage, leaks, or manufacturing defects. Make sure they’re fresh and fully charged. Avoid using batteries from different brands or with different charge levels.

Insert Batteries in the Correct Orientation

Place each new battery into the compartment, matching the +/– symbols. The positive end should align with the spring or “+” marking. Push each battery in firmly until it clicks into place.

Double-check the orientation before moving to the next battery. If you’re unsure, refer to the photo you took earlier or the diagram inside the compartment (if available).

Ensure All Batteries Are Secure

Once all four batteries are inserted, gently press down on each one to make sure they’re seated properly. Loose batteries can cause intermittent power issues.

Step 6: Reattach the Battery Cover

With the new batteries in place, it’s time to close up the compartment.

Align the Cover Correctly

Position the battery cover over the compartment, making sure it fits snugly. If it has clips or grooves, align them with the corresponding parts on the lock.

Secure the Cover

Depending on your model:

• Snap-on cover: Press firmly around the edges until it clicks into place.
• Screw-secured cover: Replace the screw and tighten it gently with a screwdriver. Don’t overtighten.
• Sliding cover: Slide it back into position until it locks.

Make sure the cover is fully closed and flush with the lock body. A loose cover can allow moisture or dust to enter, potentially damaging the electronics.

Step 7: Power On and Test the Lock

Now that the batteries are replaced, it’s time to test the lock to ensure everything is working correctly.

Turn the Lock Back On (If Disabled)

If you turned off the lock earlier, re-enable it via the app or physical switch.

Wait for the Lock to Initialize

After inserting new batteries, the lock may take 10–30 seconds to power up and reconnect to the app. You might see lights flashing or hear a beep.

Test All Functions

Verify that the lock responds to all input methods:

• App control: Open the EufySecurity app and tap the lock/unlock button. The lock should respond immediately.
• Keypad: Enter your PIN code and press the unlock button. The lock should disengage.
• Fingerprint scanner (if applicable): Place your registered finger on the scanner. It should unlock quickly.
• Manual thumb turn: Turn the interior thumb turn to ensure the bolt moves smoothly.
• Physical key (if available): Insert your backup key and turn it to confirm the lock mechanism is functional.

If any function fails, double-check the battery installation and try again.

Check the App for Confirmation

Return to the EufySecurity app and confirm that the battery level now shows as full (green). The app should also display a “Battery Replaced” or “Power Restored” notification.

Tips to Extend Battery Life

To get the most out of your Eufy smart lock batteries, follow these best practices:

• Avoid extreme temperatures: Don’t install the lock in areas exposed to direct sunlight, freezing cold, or high humidity. Extreme conditions drain batteries faster.
• Use high-quality batteries: Stick to reputable brands like Duracell, Energizer, or Amazon Basics. Cheap batteries may leak or die quickly.
• Limit unnecessary app use: Constantly checking the app or sending lock commands can drain the battery. Use it only when needed.
• Keep the lock clean: Dust and dirt can interfere with sensors and increase power consumption. Wipe the exterior regularly with a dry cloth.
• Update firmware regularly: Eufy releases updates that improve efficiency and fix bugs. Check for updates in the app every few months.
• Use the lock’s power-saving mode: Some models have a “Low Power Mode” that reduces background activity. Enable it if available.

Troubleshooting Common Issues

Even with careful installation, you might encounter problems after changing the battery. Here’s how to fix the most common issues.

Lock Doesn’t Power On

If the lock remains unresponsive after battery replacement:

• Double-check battery orientation—wrong polarity is the #1 cause of failure.
• Ensure all batteries are fully inserted and making contact.
• Try reinserting the batteries one by one.
• If the issue persists, try a different set of batteries to rule out defective units.

App Shows “Low Battery” After Replacement

This usually means the app hasn’t updated yet. Try the following:

• Force close and reopen the EufySecurity app.
• Restart your smartphone.
• Reconnect the lock to Wi-Fi by toggling airplane mode on and off.
• If the problem continues, reset the lock’s connection in the app settings.

Lock Responds Slowly or Intermittently

This could indicate weak batteries or poor contact:

• Remove and reinsert all batteries.
• Clean the battery contacts with a dry cloth.
• Replace with fresh, high-quality batteries.
• Check for firmware updates in the app.

Door Won’t Unlock After Battery Change

If the lock doesn’t disengage:

• Ensure the door is not jammed or misaligned.
• Test the manual thumb turn—if it moves freely, the issue is electronic.
• Verify that the lock is receiving power (listen for beeps or watch for lights).
• Try unlocking via the physical key to reset the mechanism.

Contact Eufy Support

If none of the above solutions work, reach out to Eufy customer support. They can guide you through advanced troubleshooting or arrange a replacement if the lock is under warranty.

Conclusion

Changing the battery in your Eufy smart lock is a simple but important task that ensures your home stays secure and your smart lock continues to work reliably. By following this step-by-step guide, you can replace the batteries quickly and confidently—no tools or technical skills required.

Remember to check your battery level regularly using the EufySecurity app, use high-quality alkaline batteries, and test all functions after replacement. With proper maintenance, your Eufy smart lock will provide years of convenient, secure access to your home.

Don’t wait until you’re locked out to learn how to change the battery. Take a few minutes today to familiarize yourself with the process, and keep spare batteries on hand. Your future self will thank you!