How long does a smart lock last?
Updated August 2026
A smart lock lasts 5–10 years, and it is the electronics, not the deadbolt, that run out the clock. The mechanical bolt behind the smarts is the same hardware that lives 20+ years in a plain lock; it is the motor, circuit board, and wireless radio that wear out and strand it at 5 to 10. Two things push it toward the short end: weather on an exposed exterior door, and a manufacturer that stops shipping firmware updates, which turns a working lock into a security liability. The batteries are a separate story, four AAs that last only 6–12 months and just need routine swapping.
Lifespan by type and situation
| Type or situation | Typical lifespan | Why |
|---|---|---|
| Deadbolt mechanism | 20+ years | The mechanical bolt outlives the electronics bolted to it |
| Electronics and motor | 5–10 years | Boards, motor, and radio are what actually wear out |
| AA batteries | 6–12 months | Not a failure, just the routine swap owners forget |
| Keypad (touch or button) | 5–8 years | Worn digits or a dead touchscreen often ends a lock early |
| Exposed exterior lock | Nearer 5 years | Rain, sun, and freeze cycles age the electronics fast |
| Lock past firmware support | Retire it | No security updates is reason enough to replace a working lock |
Signs yours is near the end
- The motor grinds, hesitates, or fails to throw the bolt all the way
- Batteries that used to last a year now drain in a few weeks
- The keypad misses presses or has visibly worn-off numbers
- It keeps dropping its Wi-Fi, Bluetooth, or Z-Wave link to the app
- The maker has stopped pushing firmware or security updates
- Condensation, corrosion, or fading on the exterior housing
How to add years
Fresh batteries and a dry install do most of the work. Swap the four AA cells the moment the app flags low power rather than running them flat, and either mount a weather shroud or choose a fully sealed model if the lock faces driving rain. Keep the firmware current so the radios and security patches stay supported, and wipe grit off the keypad and bolt so nothing chews the motor. A smart lock is one line on a wider home maintenance checklist; if it pairs with a video doorbell or a security system, plan to refresh all three on a similar cycle.
What it costs to replace: plan on $150–300 for most smart deadbolts. Replacing on your own schedule, before it fails, is almost always cheaper than the emergency version. The home maintenance cost calculator helps you set the money aside before it comes due.
OnOtto tracks your smart lock battery checks age and service history, and warns you before end of life instead of after the flood.
Track your home's systems, free for 30 daysFrequently asked questions
How long do smart lock batteries last?
Most smart locks run 6–12 months on four AA batteries, and the connection type is the biggest variable. A lock that keeps a live Wi-Fi link drains fastest, while Bluetooth or Z-Wave models stretch toward a year. Heavy daily traffic, a cold exterior door, and constant auto-lock cycling all shorten it. The lock warns you well ahead through the app and a flashing keypad, so keep a fresh set of AAs on hand and swap them before they run flat.
Do smart locks still work if the battery dies or power goes out?
Almost every smart deadbolt keeps a physical backstop for exactly this. Most retain a keyed cylinder so a metal key still opens the door, and many have two contacts on the outside where you can hold a 9-volt battery to wake the lock long enough to punch in your code. Wi-Fi and remote features need power, so those stop until you swap batteries, but the bolt itself still locks and unlocks by hand. You are never truly locked out.
Can a smart lock survive outdoor weather?
The keypad and body sit outside, so weather is the quiet killer. Driving rain, direct sun, and repeated freeze-thaw cycles corrode contacts and fog displays, pulling an exposed lock toward the low end near 5 years. A covered porch or a storm door helps a lot; if the door faces the elements, choose a model with a sealed, weather-rated exterior. Wiping road salt and grit off the keypad each season keeps the buttons and bolt working smoothly.
Should I replace a smart lock that still works but no longer gets updates?
Yes, treat a lock that no longer gets firmware updates as due for replacement even if it still turns. Smart locks are internet-connected door hardware, and unpatched security holes are a real risk once the maker walks away. The mechanical deadbolt is usually still fine, but the electronics and radios are the point of the product. At $150–300 to replace, a current model with active support is worth more than a stranded one that opens on command.