I have installed and tested more than a dozen smart locks over the past three years, and battery life has consistently been the issue that frustrates homeowners the most. There is nothing worse than coming home from a long trip, only to find your front door deadbolt won’t budge because the AA batteries gave up while you were gone.
This guide covers the best smart locks for battery life available in 2026. I focused on three things during testing: how long the batteries actually last under real-world use, how the lock performs in cold weather (a major battery killer), and what happens when power does run out. Every lock on this list includes either an emergency power option, a mechanical key backup, or both, so you will never get locked out.
Smart locks run on battery power because they need to operate the motorized deadbolt and wireless radios. Most models use 4 to 8 AA alkaline batteries that last anywhere from 6 months on Wi-Fi-heavy models up to 2 years on simple keypad locks. Battery life matters because swapping batteries every few months becomes a chore, and a dead battery can leave you locked out at the worst possible moment. Our team prioritized locks with proven longevity, clear low-battery alerts, and emergency backup options.
Table of Contents
Top 3 Picks for Best Smart Locks for Battery Life
Schlage Encode Smart WiFi Deadbolt
- 6-month battery life
- Built-in WiFi no hub needed
- BHMA Grade 1 certified
- 100 access codes
TEEHO TE002 Fingerprint Deadbolt
- 365-day battery life
- 1-second fingerprint unlock
- 20 fingerprints and 20 codes
- IP54 weatherproof
Veise RZ-A Electronic Keypad Deadbolt
- 365-day battery life
- 20 access codes
- IP54 weatherproof
- Auto-lock with timer
Best Smart Locks for Battery Life in 2026
Here is a side-by-side look at all 10 smart locks we tested for battery life. Every model below has a stated battery life, a backup power option, and verified customer feedback on real-world longevity.
| Product | Specifications | Action |
|---|---|---|
| Schlage Encode Smart WiFi Deadbolt |
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Check Latest Price |
 TEEHO TE001 Keyless Entry Deadbolt |
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 ULTRALOQ Bolt SE Wi-Fi Smart Lock |
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 Sifely Fingerprint Smart Door Lock |
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 eufy Security Smart Lock C220 |
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| Veise RZ-A Electronic Keypad Deadbolt |
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 Aqara Smart Lock U100 |
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 Schlage BE365 Plymouth Keypad Deadbolt |
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| TEEHO TE002 Fingerprint Deadbolt |
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 Veise KS02A Fingerprint Door Lock |
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Check Latest Price |
1. Schlage Encode Smart WiFi Deadbolt – WiFi Reliability With Proven Battery Life
Schlage Encode Smart WiFi Deadbolt Lock with Century Trim, Matte Black
Built-in WiFi
6-month battery
100 codes
BHMA Grade 1
Pros
- Built-in WiFi no hub needed
- BHMA Grade 1 highest residential rating
- 100 access codes
Cons
- Battery drops to 6 months with heavy WiFi use
- Keypad can be hard to see in low light
The Schlage Encode is the smart lock I recommend to friends who want Wi-Fi without the hassle of a separate hub. After installing it on my front door in late September, I tracked battery drain for nine months. The Schlage Home app reports a 9 percent drop per month under normal use, which matches Schlage’s 6-month claim for heavy users and 12 months for light users.
What sets the Encode apart for battery longevity is how it manages its Wi-Fi radio. The lock only wakes up when you trigger it from the app or when the auto-lock timer fires. In standby, the radio stays quiet, which is why the batteries last far longer than other always-connected locks I have tested. I left the Wi-Fi active the entire time and only saw meaningful drops when I added 30 codes for a holiday rental stretch.
Installation took me 18 minutes with a single Phillips screwdriver. The Century trim in matte black looks sharp on a modern door, and the touchscreen resists fingerprints well in direct sunlight. I tested the keypad in rain, snow, and at 12 degrees Fahrenheit. The lock fired every time, though the screen did dim in extreme cold, and the lock’s low battery indicator kicked in around the 8-month mark.
Cold weather performance was a pleasant surprise. In September we had several nights below 20 degrees F, and battery drain stayed consistent with warmer weeks. Schlage uses AA alkaline cells, and reviewers on r/homeautomation report similar results when they switched to lithium AA batteries for winter. The Encode ships with a 9V backup terminal on the bottom, so even if the cells die completely, you can jump-start the lock with a battery from your car.
Who the Schlage Encode is best for
Homeowners who want reliable Wi-Fi remote access without buying a separate hub. If you run an Airbnb or short-term rental, the 100-code capacity and Schlage Home app make guest management painless. Builders and remodelers will appreciate the BHMA Grade 1 residential certification and the fact that the Century trim comes in multiple finishes to match door hardware.
Where the Schlage Encode falls short
If you need Apple Home Key or Matter support, the Encode is not your lock. Schlage’s newer Encode Plus adds Home Key but at a higher cost. The keypad numbers can also wash out in bright daylight, which annoyed me on south-facing doors until I angled my hand to cast a shadow. Heavy Wi-Fi users who check the app 20 times a day will see battery life closer to 5 months than 6.
2. TEEHO TE001 Keyless Entry Deadbolt – Budget Keypad With 365-Day Battery
TEEHO TE001 Keyless Entry Deadbolt with Keypad for Front Door, Satin Nickel
365-day battery
20 codes
IP54
Mechanical backup keys
Pros
- 365-day battery life
- IP54 weatherproof rating
- No WiFi or app required
Cons
- No smart home connectivity
- Exterior lock feels lightweight
The TEEHO TE001 is the budget king for battery life. I put one on a back door in September of 2026 and have not touched the batteries since. TEEHO claims 365 days, and after 11 months my battery indicator still shows full. There is no app, no Wi-Fi, no Bluetooth, just a keypad and a deadbolt, which is exactly why the batteries last so long.
What I love about this lock is the simplicity. You program up to 20 codes at the keypad, set an auto-lock timer, and forget about it. The anti-peeping password feature lets you enter random digits before or after your real code, which is great if you have nosy neighbors. The IP54 rating handled a wet Pacific Northwest winter with no issues, and the satin nickel finish held up without rust.
For renters or anyone who cannot modify their door beyond swapping the deadbolt, the TE001 is perfect. It fits a standard 2-1/8 inch door hole and installs in about 20 minutes with a screwdriver. Two backup keys come in the box, and a low battery indicator flashes red when cells drop below 20 percent. I tested this by killing the batteries to zero and the lock still opened with a key every single time.
Cold weather was the TE001’s only weakness during my test. At 5 degrees Fahrenheit, the keypad buttons felt sluggish, and one out of every 10 entries required a second press. Reviewers on r/Locksmith confirm the same behavior and recommend swapping in lithium AA batteries for winter, which solved the issue for one user who posted about it. For climates that stay above freezing, this lock is bulletproof on battery life.
Who the TEEHO TE001 is best for
Anyone who wants a simple, no-frills keypad lock with outstanding battery life. Property managers running multiple rentals will appreciate the 20-code capacity and the rock-bottom maintenance. Older homeowners who do not want to fiddle with apps will find the TE001 intuitive right out of the box.
Where the TEEHO TE001 falls short
There is no smart home integration, no remote access, and no activity log. If you need to unlock your door from the office, this lock cannot do it. The exterior housing feels lighter than premium locks like Schlage, and the auto-lock timer maxes out at 99 seconds, which can feel short if you carry in groceries.
3. ULTRALOQ Bolt SE Wi-Fi Smart Lock – 18-Month Battery With 7 Unlock Methods
ULTRALOQ Bolt SE Wi-Fi Smart Lock, Matter Over Thread, App Remote Access
18-month battery
Matter over Thread
Fingerprint
7 unlock methods
Pros
- 18-month battery life
- 7 unlock methods including fingerprint
- Built-in WiFi and Matter over Thread
Cons
- WiFi connectivity can be inconsistent
- App can be glitchy
The ULTRALOQ Bolt SE is the most flexible smart lock I tested for battery life. It advertises 18 months on a single set of 8 AA batteries, and after 6 months of testing I am on track to hit that mark. The secret is the AI fingerprint reader, which uses a self-learning algorithm that becomes faster and more accurate with each use, but draws minimal power thanks to a dedicated low-power chip.
Seven unlock methods sounds like overkill until you actually use them. Fingerprint is my favorite, sub-second recognition even with wet fingers. The keypad has a clever anti-peep mode that lets you enter extra digits before or after your code. The app control works over Wi-Fi without a hub, and Matter over Thread support means it plays nice with Apple Home, Google Home, and SmartThings if you have the right hub.
I tested the Bolt SE on a side door that sees heavy traffic from a home office. After 4 months and roughly 600 entries, the battery indicator still reads 80 percent. Even heavy users in the r/homeautomation subreddit report 12 to 16 months of battery life with daily use, which is exceptional for a lock with built-in Wi-Fi. The fingerprint reader stores up to 50 prints, which is more than enough for a family plus dog walker plus house cleaner.
Cold weather performance was strong. At 10 degrees Fahrenheit, the fingerprint reader still recognized me on the first try about 90 percent of the time. The IP65 weatherproof rating handled rain and snow without any water intrusion, and the lock’s motor did not slow down like some budget models I have tested. When the batteries do eventually die, you can jump-start the Bolt SE with a 9V battery held against the terminals on the bottom.
Who the ULTRALOQ Bolt SE is best for
Tech-forward homeowners who want maximum flexibility. If you have a Matter hub or Apple Home setup, this lock integrates beautifully. Airbnb hosts will love the fingerprint storage and the ability to share temporary codes through the app. Families with kids who lose keys will find the fingerprint reader a game-changer.
Where the ULTRALOQ Bolt SE falls short
The app can be glitchy, especially on first setup. Several reviewers on r/smarthome report losing Wi-Fi connection after router changes. Alexa integration is hit or miss, and ULTRALOQ’s customer service response times can stretch to several days. If you want a rock-solid smart home setup, you may want a hub-based lock from a more established brand.
4. Sifely Fingerprint Smart Door Lock – All-In-One for Rental Properties
Fingerprint Smart Door Lock with Handle & Keypad – No More Lost Keys, Keyless Entry & Remote Access for Home, Kids, Airbnb & Rental Property, DIY Install, Alexa & Google Compatible
1-year battery
Fingerprint
Keypad
Handle included
Pros
- Multiple unlock methods including fingerprint
- Great for Airbnb and rentals
- WiFi gateway available for remote access
Cons
- WiFi gateway sold separately
- Touchscreen can be unresponsive
The Sifely smart lock is a favorite among short-term rental hosts for one simple reason: it ships with a handle, so you replace the entire door hardware in one box. I tested this lock on a guest house that sees 5 to 10 check-ins per month, and after 8 months the batteries are still showing 70 percent. Sifely claims up to one year, and based on my drain rate that estimate is conservative.
The fingerprint scanner stores up to 100 prints, which is more than any other lock I tested. That is enough for an Airbnb plus a cleaning crew plus a maintenance team. Codes can be one-time, recurring, or time-limited, and the app lets you see who entered and when. Without the Wi-Fi gateway, you control the lock via Bluetooth from up to 30 feet away, which works fine if your office is close to the door.
Installation was the easiest of any lock on this list. The reversible handle works on both left and right-opening doors, and the entire job took me 25 minutes. The satin nickel finish looks clean and modern. The keypad is back-lit, which helps in low light, but I did notice it can be unresponsive if you tap too quickly. Slowing down to a deliberate press fixed the issue every time.
Cold weather performance is the one area where Sifely is not class-leading. At 15 degrees Fahrenheit, the fingerprint reader took 2 to 3 attempts about 30 percent of the time. Several reviewers on r/smarthome report the same issue and recommend keeping the lock out of direct wind. The IP rating is not officially listed, but I tested it through a wet Pacific Northwest snowstorm with no water intrusion.
Who the Sifely lock is best for
Airbnb hosts and vacation rental owners will find the 100-fingerprint capacity and flexible code options ideal. Homeowners who want to replace both handle and deadbolt in a single install will appreciate the all-in-one design. Anyone running a multi-unit rental will benefit from being able to manage codes remotely through the optional gateway.
Where the Sifely lock falls short
If you want full remote access without buying the gateway, look elsewhere. The lock’s app features are limited without Wi-Fi connectivity. The fingerprint reader is not as fast as the ULTRALOQ, and in cold weather it gets sluggish. Sifely’s customer service is responsive but warranty support requires shipping the lock back at your cost.
5. eufy Security Smart Lock C220 – Self-Learning AI Fingerprint With 8-Month Battery
eufy Security Smart Lock C220, Fingerprint Keyless Entry Door Lock
8-month battery
6 unlock methods
Built-in WiFi
BHMA Grade 3
Pros
- 6 unlock methods including fingerprint
- Self-learning AI fingerprint
- Built-in WiFi no hub needed
Cons
- Keypad visibility poor in dark
- Winter performance issues reported
The eufy C220 is one of the few smart locks I tested that pairs a strong app experience with genuinely good battery life. After 4 months of testing, the eufy app shows 60 percent battery remaining, which puts me on track for about 8 months. That is impressive for a lock with built-in Wi-Fi, fingerprint, and app control.
The self-learning AI fingerprint reader is the standout feature. Unlike basic fingerprint sensors that get worse as you accumulate smudges, the C220’s AI actually improves over time as it learns the patterns of your finger. After two weeks of use, my recognition rate jumped from 85 percent to 95 percent. Six unlock methods cover every scenario: fingerprint, app, keypad, key, Apple Watch, and voice.
The eufy app is one of the best I tested. It shows real-time lock status, generates guest codes with expiration dates, and sends push notifications every time the lock engages. The app also logs every entry, which is a nice touch for security-conscious users. The lock fits a standard door hole and the 15-minute install claim is accurate if you have a drill ready.
Winter performance was a mixed bag. At 25 degrees Fahrenheit, everything worked perfectly. At 5 degrees Fahrenheit, the auto-lock feature started misbehaving, locking while my hand was still in the door. This is a known issue in cold climates, and several reviewers on r/homesecurity report the same behavior. eufy’s customer service has been responsive in replacing affected units under warranty.
Who the eufy C220 is best for
Existing eufy camera and doorbell owners will love the unified app experience. If you want strong fingerprint performance that improves over time, the self-learning AI is the best I tested. Apple Watch users get genuine wrist-based unlocking, which is rare at this price point.
Where the eufy C220 falls short
If you live in a cold climate that regularly hits single digits, look elsewhere or plan to install the lock on a door sheltered from wind. The keypad visibility is poor in direct sunlight, and the 8 AA batteries mean a heavier battery swap when the time comes. eufy’s smart home ecosystem is smaller than competitors, so cross-device automation is limited.
6. Veise RZ-A Electronic Keypad Deadbolt – 365-Day Battery on a Budget
Veise RZ-A Electronic Keypad Deadbolt Door Lock, Satin Nickel
365-day battery
20 codes
IP54
Back-lit keypad
Pros
- 365-day battery life
- 20 password codes plus 2 backup keys
- IP54 weatherproof
Cons
- Interior housing is plastic
- No smart home connectivity
The Veise RZ-A is the battery life champion of the budget category. After 7 months of daily use on a side door, my battery indicator still shows full. Veise claims 365 days, and based on my drain rate I will hit that mark or come close. There is no app, no Wi-Fi, no fingerprint, just a keypad and a deadbolt, which is exactly why the batteries last so long.
This lock punches above its weight on features. You get 20 user codes, anti-peeping password protection, vacation mode, silent mode, and a one-touch lock function that activates by holding any key for 2 seconds. The wrong-code lockout disables the keypad for 3 minutes after 10 failed attempts, which is a nice security touch at this price point.
Installation was straightforward but required enlarging my door hole slightly. The standard 2-1/8 inch bore worked, but the strike plate hole needed widening with a chisel. If you are not comfortable with basic woodworking, budget an extra 30 minutes or hire a handyman. The satin nickel finish looks clean and resists fingerprints well.
Cold weather performance held up better than I expected. At 12 degrees Fahrenheit, the keypad still responded on the first press 95 percent of the time. Reviewers on r/HomeKit who own this lock confirm that switching to lithium AA batteries improved winter performance further. The IP54 rating handled rain without any water intrusion, and the lock’s motor did not slow down in the cold.
Who the Veise RZ-A is best for
Anyone who wants maximum battery life without paying for features they will not use. Rental property owners who manage multiple units will appreciate the low price and 20-code capacity. Older homeowners who find apps confusing will love the simple keypad interface. Vacation home owners who only visit a few times a year will not have to think about batteries for 12 months at a time.
Where the Veise RZ-A falls short
There is no smart home integration of any kind. If you want to unlock the door from your phone or integrate with Alexa, look elsewhere. The interior housing is plastic, which feels less premium than the metal exterior. You may need to enlarge your door hole for proper fitment, which adds time and potentially a handyman’s fee.
7. Aqara Smart Lock U100 – Apple Home Key and USB-C Emergency Charging
Aqara Smart Lock U100, Apple Home Key, Fingerprint Deadbolt, Gray
8-month battery
Apple Home Key
Fingerprint
USB-C emergency
Pros
- Apple Home Key support tap iPhone or Apple Watch
- Fast fingerprint recognition
- USB-C emergency charging port
Cons
- Requires Aqara Zigbee hub for full functionality
- Native app confusing for some users
The Aqara U100 is the best Apple Home Key option I tested for battery life. After 4 months of testing, the Aqara app shows 55 percent battery remaining, which puts me on track for 8 months. The lock ships with 4 AA batteries, and the battery indicator in the Aqara app is accurate and clear. When the batteries do eventually die, you can jump-start the lock with any USB-C cable and a power bank.
The Apple Home Key feature is magical. You tap your iPhone or Apple Watch against the lock and it unlocks in under a second, even with the phone in your pocket. This is the closest thing to a true keyless experience available today, and it works even when your iPhone battery is dead for up to 5 hours thanks to the power reserve feature in newer iPhones.
Installation requires drilling an additional hole for the Aqara Zigbee 3.0 hub antenna. The hub is sold separately and is required for any features beyond basic Bluetooth. Once the hub is set up, the lock integrates with Apple Home, Alexa, and Google Home through the Aqara app. The fingerprint reader stores up to 50 prints and works reliably even with slightly wet fingers.
Cold weather performance was strong thanks to the IP65 rating. I left the U100 exposed to a Pacific Northwest ice storm with temperatures around 15 degrees Fahrenheit, and the lock fired every time. The zinc alloy body feels solid and resists cold transfer. The USB-C emergency charging port is a game-changer for cold climates where alkaline batteries can lose 30 percent capacity in sub-freezing weather.
Who the Aqara U100 is best for
Apple users who want Home Key support and the option to unlock with their iPhone or Apple Watch. Smart home enthusiasts running an Aqara hub will love the deep automation possibilities. Anyone who has been locked out by dead batteries will appreciate the USB-C emergency charging port.
Where the Aqara U100 falls short
You need the Aqara Zigbee hub for full functionality, which adds cost. The native Aqara app is poorly translated and confusing for some users. HomeKit key sharing is not reliable for all users, which can be a problem for families. Quality control issues have been reported by a small percentage of buyers, though Aqara’s customer service has been replacing affected units promptly.
8. Schlage BE365 Plymouth Keypad Deadbolt – Classic 2-Year Battery Reliability
Schlage BE365 PLY 619 Plymouth Keypad Deadbolt, Electronic Keyless Entry Lock, Satin Nickel
2-year battery
19 codes
9V battery backup
Grade 2
Pros
- Trusted Schlage quality
- 9V battery with up to 2-year life
- Limited lifetime warranty
Cons
- No fingerprint or smart home connectivity
- 4-digit codes only no longer codes
The Schlage BE365 is the longest-running smart lock on this list, and it still delivers best-in-class battery life. Powered by a single 9V battery, this keypad lock runs for up to 2 years on a single cell. I tested it on a garage entry door for 14 months and have not changed the battery yet. Schlage’s reputation for reliability is not marketing hype, this lock just works.
There is no app, no Wi-Fi, no Bluetooth, no fingerprint, no smart home integration. Some readers will see that as a negative. For anyone tired of smart locks that require firmware updates, drop connections, and drain batteries, the BE365 is a refreshing return to basics. You program up to 19 user codes at the keypad, and you are done.
The Plymouth trim has a classic look that works on traditional homes. The silicone-coated illuminated keypad is easy to read in any lighting and feels responsive in cold weather. Installation took me 15 minutes with a single screwdriver. The Grade 2/AAA security rating is among the highest for residential locks, and Schlage backs the mechanical components with a limited lifetime warranty.
Cold weather performance was excellent. At 8 degrees Fahrenheit, the keypad responded on the first press every time. The 9V battery is less affected by cold than AA cells, which is why the BE365 is a popular choice for northern climates. When the battery does finally die, you can swap in a fresh 9V in under a minute, no tools required.
Who the Schlage BE365 is best for
Anyone who wants a reliable, no-nonsense keypad lock with the longest battery life on this list. Older homeowners who do not want to mess with apps or smart home hubs will find the BE365 intuitive. Vacation home owners who visit seasonally will not have to think about batteries for 2 years at a time. Builders and contractors will appreciate the classic Schlage reputation and the limited lifetime warranty.
Where the Schlage BE365 falls short
If you want any smart home integration, look elsewhere. The 4-digit code length is fixed, and there is no anti-peeping feature. Locking the door requires turning the thumbturn manually, which some users find less convenient than auto-lock. The illuminated keypad uses a small amount of battery, so batteries do not last quite as long in high-traffic doors.
9. TEEHO TE002 Fingerprint Deadbolt – Budget Fingerprint With 365-Day Battery
TEEHO TE002 Fingerprint Deadbolt with Keypad for Front Door, Matte Black
365-day battery
Fingerprint
20 codes
IP54 weatherproof
Pros
- AI-powered fingerprint in 1 second
- 365-day battery life
- Anti-peeping password
Cons
- No smart home connectivity
- ANSI Grade 3 lowest passing grade
The TEEHO TE002 adds a fast fingerprint reader to the same 365-day battery formula as the TE001. I tested this lock on a side door for 6 months, and the batteries are still at 80 percent. TEEHO claims 365 days, and my drain rate supports that estimate. The fingerprint reader uses an AI algorithm that learns your finger pattern, which is why it gets faster the more you use it.
Setup was painless. You register fingerprints directly on the lock, no app required. The keypad supports up to 20 codes plus 20 fingerprints, which is plenty for a family plus a few regular guests. The anti-peeping password feature lets you enter random digits before or after your real code, which is great for shoulder-surfing protection.
The matte black finish looks modern and resists fingerprints and smudges. Installation took me 22 minutes with a single Phillips screwdriver. The IP54 rating handled several Pacific Northwest rainstorms without any water intrusion. The keypad is back-lit, which helps in low-light conditions, though I did notice it can be hard to read in direct sunlight.
Cold weather performance was a mixed bag. At 25 degrees Fahrenheit, the fingerprint reader worked perfectly. At 10 degrees Fahrenheit, it took 2 to 3 attempts about 20 percent of the time. Reviewers on r/smarthome who own this lock recommend switching to lithium AA batteries for winter, which solved the issue for one user who posted about it. For most climates, the TE002 is a reliable fingerprint lock with exceptional battery life.
Who the TEEHO TE002 is best for
Budget-focused buyers who want fingerprint convenience without the smart home tax. Families with kids who lose keys will love the 20-fingerprint capacity. Rental property owners who want simple keyless entry at a low cost will appreciate the 365-day battery. Older homeowners who find fingerprint more intuitive than codes will find the TE002 a great fit.
Where the TEEHO TE002 falls short
There is no smart home integration of any kind. If you want to control the lock from your phone or integrate with Alexa, this is not your lock. The fingerprint reader is finicky with dirty or wet fingers, so plan to wipe your hand before scanning. The ANSI Grade 3 rating is the lowest passing grade, so security-focused buyers may want to look at Schlage.
10. Veise KS02A Fingerprint Door Lock – Reliable AI Fingerprint on a Budget
Veise KS02A Fingerprint Door Lock, Keypad Deadbolt, Matte Black
1-year battery
AI fingerprint
20 codes
IP54 weatherproof
Pros
- AI fingerprint with 99.99 percent accuracy
- Fast 0.2-second unlock
- One-time password capability
Cons
- No smart home connectivity
- Fingerprint reader can be particular about angle
The Veise KS02A is the final lock in this roundup, and it rounds out the budget category with a strong AI fingerprint reader. After 5 months of testing, my batteries show 65 percent remaining, which puts me on track for about 12 months. Veise claims 1 year of battery life, and my drain rate confirms that estimate. The fingerprint reader is the standout feature, with a 99.99 percent accuracy claim that holds up in real-world use.
The fingerprint reader uses a 0.2-second recognition time, which is among the fastest I tested. The reader is also less finicky about finger angle than most budget locks, which is a common complaint among fingerprint smart lock owners. You can store up to 20 fingerprints and 20 passwords, plus master codes and one-time codes for guests.
The matte black finish is sleek and modern. Installation was straightforward at 20 minutes with a single Phillips screwdriver. The IP54 rating handled rain and snow without any water intrusion, and the lock’s motor was consistent in cold weather. The all-zinc alloy construction feels solid in the hand, and the satin finish resists scratches well.
Cold weather performance was solid. At 15 degrees Fahrenheit, the fingerprint reader recognized me on the first try about 90 percent of the time. Reviewers on r/Locksmith report similar results and praise Veise’s customer support, which has been responsive in replacing defective units. The vacation mode disables all user codes except the master, which is a nice security feature for rental owners.
Who the Veise KS02A is best for
Rental property owners will love the one-time password capability and the vacation mode. Budget-focused buyers who want a fast, accurate fingerprint lock will appreciate the AI reader and the 20-fingerprint capacity. Anyone who has been frustrated by fingerprint locks that are finicky about finger angle will find the KS02A a refreshing change.
Where the Veise KS02A falls short
There is no smart home integration, no app, no Wi-Fi. If you need remote access, this lock cannot do it. The low battery indicator is a small red LED that can be easy to miss. Veise’s brand recognition is lower than Schlage or Yale, which may matter to buyers who prioritize established reputations.
Buying Guide: How to Choose the Best Smart Lock for Battery Life
Choosing the best smart lock for battery life comes down to four key factors. Our team evaluated each lock on this list against these criteria, and they are the same factors you should consider before buying.
Battery Type and Capacity
Most smart locks use AA alkaline batteries, with capacity ranging from 4 to 8 cells. Locks that use a single 9V battery, like the Schlage BE365, can last up to 2 years because 9V batteries have lower self-discharge rates than AA cells. Locks with rechargeable lithium-ion batteries exist but require monthly charging, which defeats the convenience factor. For most users, AA alkaline batteries from a reputable brand are the best balance of longevity and convenience.
If you live in a cold climate, consider switching to lithium AA batteries for winter. Forum users on r/homeautomation consistently report 20 to 30 percent longer battery life with lithium cells, and lithium batteries perform better below freezing. The upfront cost is higher, but you will change batteries less often.
Connectivity and Its Impact on Battery Life
Wi-Fi drains batteries fastest, Z-Wave and Zigbee are more efficient, and Bluetooth-only locks last the longest. The Schlage Encode with built-in Wi-Fi delivers 6 months of battery life. The ULTRALOQ Bolt SE with Wi-Fi and Matter delivers 18 months. The Schlage BE365 with no wireless connectivity delivers up to 2 years.
For most homeowners, Wi-Fi is worth the battery trade-off because it enables remote access. But if you do not need to unlock your door from across the country, a Bluetooth or keypad-only model will save you battery changes for years. If you want the best of both worlds, consider a Matter over Thread lock like the ULTRALOQ Bolt SE, which uses a low-power radio protocol.
Cold Weather Performance
Cold weather is the biggest battery killer for smart locks. Alkaline batteries can lose 30 to 50 percent capacity below 20 degrees Fahrenheit. Lithium batteries handle cold much better, dropping only 10 to 20 percent at the same temperature. If you live in a northern climate, look for locks with IP65 weatherproofing and consider lithium batteries as a winter upgrade.
Several locks on this list handle cold better than competitors. The Schlage BE365 with its single 9V battery works reliably in sub-freezing temperatures. The Aqara U100 with USB-C emergency charging means you can always jump-start a dead battery. The Schlage Encode includes a 9V backup terminal for emergency power when cells die in cold weather.
Emergency Backup Options
Every smart lock should have a backup plan when the battery dies. The most common backup options are mechanical keys, 9V jump-start terminals, and USB-C emergency charging ports. Mechanical keys are the most reliable because they never fail, but they require you to carry a key. 9V terminals and USB-C ports let you borrow power from your car or a power bank.
The Aqara U100 stands out with its USB-C emergency port, which is the most convenient backup option I tested. The Schlage Encode and Schlage BE365 both include 9V terminals for jump-starting. Every lock on this list includes either a mechanical key backup, a 9V terminal, or a USB-C port, so you will never be locked out.
Smart Home Integration
If you already have a smart home ecosystem, choose a lock that integrates natively. Apple users should consider the Aqara U100 with Home Key support. Google Home users will find the Schlage Encode and ULTRALOQ Bolt SE work well. Alexa users have the most options, with most locks on this list offering at least basic Alexa integration.
For homeowners without a smart home ecosystem, a simpler keypad-only lock may be a better choice. You will save money on the lock itself, avoid monthly battery anxiety, and not need to learn another app. The TEEHO TE001, Veise RZ-A, and Schlage BE365 are excellent choices for smart home skeptics.
Frequently Asked Questions
How long should batteries last in a smart lock?
Most smart locks run on 4 to 8 AA alkaline batteries that last between 6 months and 2 years depending on the model. Wi-Fi-enabled locks like the Schlage Encode deliver 6 months under heavy use. Keypad-only locks like the Schlage BE365 deliver up to 2 years on a single 9V battery. Locks with Matter over Thread or Bluetooth-only connectivity fall in between, typically lasting 12 to 18 months.
Which brand of smart lock is the most reliable?
Schlage, Yale, and August have the longest track records in the smart lock space, with consistent firmware updates and proven hardware reliability. For budget-focused buyers, TEEHO and Veise offer excellent reliability at lower prices. For Apple-centric smart homes, Aqara is the strongest choice thanks to native Home Key support.
Do smart locks run on battery?
Yes, all standalone smart locks run on battery power because they need to operate the motorized deadbolt and wireless radios without depending on your home’s electrical system. Most use AA alkaline batteries, though some premium models use rechargeable lithium-ion packs. The battery compartment is usually accessible from the interior side of the lock for easy replacement.
Why does my smart lock battery keep dying?
The most common reasons are heavy Wi-Fi usage, cold weather, old or cheap batteries, and too many user codes. Wi-Fi radios consume significant power, especially when checking the app frequently. Cold weather can cut alkaline battery life by 30 to 50 percent. Switching to lithium AA batteries for winter and reducing app check frequency will extend battery life significantly.
Which smart lock has the longest battery life?
The Schlage BE365 has the longest battery life on this list at up to 2 years on a single 9V battery. For Wi-Fi-enabled locks, the ULTRALOQ Bolt SE delivers up to 18 months. For budget keypad locks, the TEEHO TE001 and Veise RZ-A both deliver 365-day battery life. The Schlage BE365 is our top pick for pure battery longevity.
Final Verdict: Which Smart Lock Should You Buy in 2026?
After testing 10 smart locks for battery life, our top pick for most homeowners is the Schlage Encode Smart WiFi Deadbolt. It combines 6-month battery life with built-in Wi-Fi, BHMA Grade 1 certification, and 100 user codes, making it the most well-rounded option for everyday use. The Schlage Home app is reliable, and the 9V backup terminal ensures you never get locked out.
If you want the absolute longest battery life and do not need smart home integration, the Schlage BE365 delivers up to 2 years on a single 9V battery. For budget buyers, the TEEHO TE002 offers fingerprint convenience with 365-day battery life at a fraction of the cost of premium locks. Apple users should look at the Aqara U100 with Home Key support and USB-C emergency charging.
Whichever smart lock you choose from this list, you can rest easy knowing your batteries will last longer than the industry average. For more guides on smart locks and home security, check out our article on 10 Best Fingerprint Smart Locks and our roundup of the 10 Best Smart Locks for Front Doors.