Smart locks have quickly become a staple in modern home security, blending technology with everyday convenience. But let’s be honest—while fingerprint readers and remote unlocking are cool, none of it matters if your lock dies unexpectedly. That’s why battery life is one of the most critical factors when choosing a smart lock.
If you’re tired of swapping out batteries every few months or are researching your first smart lock purchase, this guide will walk you through the best options for long battery life, explain why some locks last longer, and help you make a confident decision.
🧠 Why Battery Life in Smart Locks Really Matters
Unlike traditional locks that last decades without any power source, smart locks are mini-computers—they depend entirely on batteries to function. If the battery dies and there’s no backup plan, you’re locked out. That’s not just inconvenient; it can be a safety risk.
A smart lock with strong battery life saves you time, effort, and unnecessary frustration. It also means fewer maintenance costs and less stress about unexpected shutdowns.
🔍 What Affects a Smart Lock’s Battery Life?
Not all smart locks are created equal. Several technical and environmental factors influence how long a battery will last:
1. Connection Type
- Wi-Fi: Always-on connections are convenient but drain power fast. Expect 3–6 months of battery life if used frequently.
- Bluetooth / Z-Wave / Zigbee / Thread: These low-energy protocols offer better longevity—usually 10–18 months or even longer.
- Matter (Thread-based): A newer standard gaining popularity for its balance of low power and high performance.
2. Usage Frequency
The more often you lock and unlock—especially remotely—the faster you’ll deplete the battery. High-traffic homes should prioritize efficient models.
3. Battery Type
- AA or AAA alkaline batteries: Common and cheap, but not always the longest-lasting.
- Rechargeable lithium packs: More eco-friendly and sometimes last longer per charge.
- Emergency options: Look for locks with USB-C or 9V terminals so you’re not stranded if the battery dies.
4. Smart Features in Use
Auto-locking, motion sensors, continuous background syncing—each drains power. The more bells and whistles, the faster your batteries will run out.
🏆 Top Smart Locks Known for Long Battery Life
Here’s a look at the most power-efficient smart locks currently on the market. These aren’t just long-lasting—they’re also reliable, secure, and user-approved.
🔐 1. Schlage Connect Smart Deadbolt (Z-Wave or Zigbee)
- Battery Life: Up to 24 months on four AA batteries
- Connection: Z-Wave or Zigbee
- Backup Options: Physical key + audible low-battery alerts
- Best For: SmartThings, Ring Alarm, and other Z-Wave systems
Why It Lasts So Long: Schlage’s Z-Wave version avoids Wi-Fi’s battery-draining pitfalls. Its firmware also efficiently sleeps when not in use.
Pros:
- ANSI/BHMA Grade 1 security rating
- Works with most smart hubs
- Easy to install and program
Cons:
- No built-in Wi-Fi (requires a hub)
- Keypad isn’t as sleek as newer models
🔐 2. Yale Assure Lock 2 (Bluetooth + Optional Wi-Fi Module)
- Battery Life: 10–12 months (Bluetooth); 6–8 months (with Wi-Fi module)
- Connection: Bluetooth, Wi-Fi (optional), Z-Wave, Matter
- Backup Options: 9V emergency jump-start terminal
- Best For: People who want a flexible, future-proof smart lock
Why It Lasts: When used without Wi-Fi, the Yale Assure 2 is incredibly energy-efficient, thanks to Bluetooth and Thread/Matter compatibility.
Pros:
- Sleek touchscreen design
- Supports multiple platforms
- Auto-unlock and DoorSense compatibility
Cons:
- Shorter life with Wi-Fi
- Some learning curve during setup
🔐 3. August Smart Lock Pro (3rd Gen)
- Battery Life: About 12 months on four AA batteries
- Connection: Bluetooth (Wi-Fi bridge optional)
- Backup Options: Retains your existing key
Why It Stands Out: August lets you keep your original deadbolt, so there’s no complex installation—and the Bluetooth-only mode sips power.
Pros:
- Ideal for renters
- Works with most deadbolts
- Easy to install and manage via app
Cons:
- Requires bridge for remote access
- Battery life drops if Wi-Fi is used constantly
🔐 4. Ultraloq U-Bolt Pro
- Battery Life: 10–12 months on AA batteries
- Connection: Bluetooth (Wi-Fi Bridge optional)
- Backup Options: Physical key, fingerprint reader
Why It Lasts: Smart power-saving in the fingerprint sensor and efficient app syncing stretch the battery life well beyond average.
Pros:
- 6-in-1 access methods (code, app, fingerprint, etc.)
- Durable construction
- Affordable price point
Cons:
- Small learning curve to configure properly
- Bridge sold separately
🔐 5. Eufy Security Smart Lock S330 (FamiLock S3 Max)
- Battery Life: 10–12 months average
- Connection: Wi-Fi (optimized for energy)
- Backup Options: Rechargeable battery + AAA backup
Why It’s Impressive: Despite being a Wi-Fi lock with a built-in fingerprint reader and video doorbell, it still manages excellent battery performance.
Pros:
- Video doorbell + lock in one
- Local storage for footage (no monthly fees)
- Strong battery backup strategy
Cons:
- Higher upfront cost
- Requires more frequent charging under heavy use
🔐 6. Lockly Secure Pro / Vision Elite
- Battery Life: Up to 12 months on 4 AA batteries
- Connection: Bluetooth + optional Wi-Fi
- Backup Options: USB port + mechanical key
Why It Lasts: Lockly’s PIN Genie system reduces unnecessary wake-ups from screen taps, preserving battery.
Pros:
- Dynamic keypad prevents code peeking
- High-accuracy fingerprint sensor
- Built-in camera (Vision Elite)
Cons:
- UI feels slightly outdated
- Can be pricey
📊 Smart Lock Battery Life Comparison Table
| Model | Max Battery Life | Connection | Backup Access | Notable Feature |
|---|---|---|---|---|
| Schlage Connect BE469ZP | Up to 2 years | Z-Wave / Zigbee | Key + alerts | Top security rating |
| Yale Assure Lock 2 | 12 months (BT) | Bluetooth / Wi-Fi | 9V battery terminal | Supports Matter, modular design |
| August Smart Lock Pro | 12 months | Bluetooth (Wi-Fi opt) | Keeps original key | Perfect for renters |
| Ultraloq U-Bolt Pro | 12 months | Bluetooth | Fingerprint + key | Multi-method access |
| Eufy Smart Lock S330 | 10–12 months | Wi-Fi | Rechargeable + AAA | All-in-one with camera + lock |
| Lockly Secure / Vision | 12 months | Bluetooth / Wi-Fi | Key + USB port | Dynamic PIN system |
💡 Tips to Maximize Your Smart Lock’s Battery Life
Even the most efficient lock can run down faster than expected if not used wisely. Here’s how to get the most out of your smart lock batteries:
- Avoid Wi-Fi if You Don’t Need It
Bluetooth or Z-Wave connections use a fraction of the power Wi-Fi does. - Turn Off Extra Features
Auto-unlock, constant activity logging, or excessive alerts drain the battery. Disable features you rarely use. - Use Quality Batteries
Cheap AAs might save a dollar but cost you more in the long run. Use lithium or premium alkaline batteries for better life. - Keep Firmware Updated
Manufacturers often release updates to improve power efficiency. - Install in a Moderate Climate
Extreme cold can reduce battery efficiency. If you live in a freezing climate, expect slightly shorter battery life.
🙋 Frequently Asked Questions
Q: What happens when the smart lock battery dies?
Most smart locks give you plenty of warning with app alerts, beeps, or visual cues. But if it does die completely, emergency power (like a 9V port) or your physical key can get you in.
Q: Are rechargeable batteries better for smart locks?
Rechargeables are great if the lock supports them. They’re eco-friendly and lower long-term costs, but always use the type the manufacturer recommends—some smart locks don’t work well with rechargeables.
Q: Do video doorbell locks kill battery faster?
Yes, significantly. Streaming video requires continuous power, which is why models like the Eufy S330 include a rechargeable pack and battery backup.
✅ Final Recommendations
- For maximum battery life: Go with Schlage Connect (Z-Wave or Zigbee) or Yale Assure Lock 2 (Bluetooth only).
- For modern looks + smart features: Try Yale Assure 2 or Lockly Secure Pro.
- For retrofit ease: August Smart Lock Pro keeps your existing lock.
- For biometric lovers: Check out Ultraloq or Lockly for fingerprint access.
- For built-in camera and smarts: Eufy Smart Lock S330 is a one-stop shop.
🛒 A Buyer’s Checklist for Smart Locks in 2025
Before you hit the “Buy Now” button, make sure you’ve considered the following factors. Smart locks are a long-term investment—taking 5 extra minutes now can save you hours (and headaches) later.
✅ 1. Battery Life Expectations
How often do you plan to use the lock?
- High-traffic homes may need locks with at least 10–12 months of battery life.
Will you be using Wi-Fi daily?
- Stick to Bluetooth/Z-Wave if battery life is a major concern.
✅ 2. Power Source and Backup Options
What kind of batteries does it use?
- Standard AAs are easiest to replace; lithium lasts longer.
Is there a backup key or emergency port?
- Essential for peace of mind—especially during power outages or if the battery dies.
✅ 3. Compatibility with Your Smart Home
Are you using Alexa, Google Assistant, or Apple HomeKit?
- Not all locks work with all platforms—double-check support.
Do you already own a hub (like SmartThings or Ring)?
- Look for Z-Wave or Zigbee-compatible locks.
✅ 4. Installation Requirements
Will it fit your current deadbolt setup?
- Some locks like August retrofit onto your existing lock.
Are you comfortable with DIY installation?
- Most models are easy to install with a screwdriver, but others may need professional help.
✅ 5. Features That Actually Matter to You
Fingerprint sensor? Auto-lock? App alerts?
- Don’t pay extra for features you’ll never use.
Is remote access important?
- If yes, you’ll need a model with built-in Wi-Fi or a bridge.
✅ 6. Security Certifications
Does it have ANSI/BHMA rating?
- Grade 1 is the highest for residential locks.
Does the app offer two-factor authentication (2FA)?
- Essential for preventing unauthorized remote access.
✅ 7. Weather and Durability
Is it rated for outdoor use?
- Some locks are only intended for interior doors.
Can it handle your climate?
- Check for temperature ratings, especially if you live somewhere hot or freezing.
✅ 8. User Access Management
Can you set temporary codes for guests or workers?
- Great for Airbnb hosts, babysitters, or cleaners.
Does it support multiple users with activity logs?
- Helps you track who’s coming and going.
🎯 Final Thoughts: Choose Convenience Without Compromise
In 2025, smart locks have evolved into powerful tools for home security, automation, and convenience. But no matter how sleek or high-tech the design, battery life still determines reliability. A lock is only as smart as its uptime.
To recap:
- If you value maximum battery longevity, go with Schlage Connect or Yale Assure Lock 2 with Bluetooth only.
- Want flexibility with smart home systems? Choose a lock that supports Matter, Z-Wave, or your preferred voice assistant.
- Need a balanced feature set with decent battery life? Consider Ultraloq U-Bolt Pro or the August Smart Lock Pro.
💡 And don’t forget: even the longest-lasting smart lock will eventually need new batteries. Enable app notifications and monitor your power levels every few months. A quick battery check now can prevent a frustrating lockout later.
✨ Your Next Step
Still unsure which lock fits your lifestyle? Feel free to read:
- Smart lock recommendations for rental properties
- The best locks with Apple HomeKit support
- A guide comparing keypad vs. fingerprint vs. app-only locks