Best Smart Lock Backup Power Options for a Power Cut

A dead outlet should never mean a dead door. This guide covers the best smart lock backup power options for a power cut, so a home or office keeps locking, unlocking, and logging entries when the grid goes down.

The picks fall into three buyer profiles: homeowners with a residential smart lock, property managers running access-controlled doors, and small-office operators who want one unit to cover locks plus desk gear. The overview table below puts every pick side by side; full reviews and a buying checklist follow.

Overview of the Picks

Product	Key Spec	Best Use	Price Tier
CHAMBERLAIN myQ Smart Lock Rechargeable Battery	Rechargeable, fast charging	myQ smart locks	Budget
AC90V/260V 5A Access Control Power Supply Box	DC12V UPS backup, time delay	Electric door locks	Budget
Dormakaba Saflok Emergency Lock Power Supply	Emergency lock power supply	Saflok lock systems	Mid-range
GOLDENMATE 600VA/360W Lithium UPS Battery Backup	76.8Wh LiFePO4, 6 outlets, 2 USB	Office devices and locks	Mid-range
Von Duprin PS914-BBK Power Supply with Battery Backup Kit	Power supply plus battery kit	Commercial exit hardware	Premium

CHAMBERLAIN myQ Smart Lock Rechargeable Battery

Type: Rechargeable battery pack
Compatibility: myQ Video Smart Lock and myQ Smart Lock
Charging: Fast charging
Intended use: Backup power for a smart lock

CHAMBERLAIN myQ Smart Lock Rechargeable Battery is the simplest answer for anyone already inside the myQ ecosystem. It is a spare battery built specifically for the myQ Video Smart Lock and the standard myQ Smart Lock, so a household can keep one charged and swap it in when the installed pack runs low. Fast charging shortens the turnaround between a depleted pack and a ready spare.

The appeal is that it removes the outage problem at its source. A lock with a charged spare on the shelf keeps working through a blackout because the lock never depended on house wiring in the first place. Buyers who rent, or who live somewhere the power flickers often, get the most from a second pack.

Trade-off: It only fits myQ locks, so it is useless to anyone running a different brand, and a single spare covers one lock at a time.

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AC90V/260V 5A Access Control Power Supply Box

Type: Access control power supply box
Input: AC90V/260V
Output: DC12V
Current: 5A
Backup: UPS battery
Feature: Time delay

AC90V/260V 5A Access Control Power Supply Box is a hardwired box for electric door locks rather than a consumer gadget. It takes a wide AC input range, steps it down to DC12V at 5A, and carries a UPS battery so the lock keeps holding through an outage. The time delay setting lets an installer control how long the lock releases before it re-engages.

This is the pick for a building with strike plates, maglocks, or other electric locking hardware that expects a dedicated DC supply. The wide input range suits properties where supply voltage is inconsistent, and the enclosure format is meant to be mounted near the door rather than on a desk. Installation is a job for someone comfortable with mains wiring.

Trade-off: The terminal-and-enclosure design assumes an installer, and there is no outlet or USB output for anything beyond the lock circuit.

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Dormakaba Saflok Emergency Lock Power Supply P#A21100-F

Type: Emergency lock power supply
System: Dormakaba Saflok
Part reference: P#A21100-F
Intended use: Backup power for Saflok locks

Dormakaba Saflok Emergency Lock Power Supply P#A21100-F is a system-specific part for hotels and managed properties running Saflok electronic locks. It exists so a Saflok door still releases during a power failure instead of trapping guests or staff behind a dead lock. The part number in the name makes it straightforward to match against an existing installation.

The buyer here is a facilities manager or hotel engineer replacing a failed unit, not a homeowner shopping for a front door. Because it is tied to one lock family, it slots into an existing Saflok setup without adapters or rewiring. Keeping a spare on hand shortens downtime when one fails during a busy period.

Trade-off: It is locked to the Saflok platform and priced as commercial hardware, so it makes no sense outside that ecosystem.

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GOLDENMATE 600VA/360W Lithium UPS Battery Backup and Surge Protector

Type: Lithium UPS battery backup and surge protector
Rating: 600VA/360W
Battery: 76.8Wh LiFePO4
Outlets: 6
Ports: 2 USB plus wireless charging
Mounting: Wall mount, compact design

GOLDENMATE 600VA/360W Lithium UPS Battery Backup and Surge Protector is the flexible option for a home office or small front desk. It combines surge protection with a LiFePO4 battery, so the lock’s power adapter, a router, and a couple of desk devices all ride through a short outage on the same unit. Six outlets, two USB ports, and a wireless charging pad cover the everyday charging clutter too.

LiFePO4 chemistry is the draw: it holds up over more charge cycles and tolerates being topped off regularly better than older battery types. The compact wall-mount body can go on a wall near the door rather than eating floor space. Buyers who want one box to protect the lock and the network gear behind it get the most value here.

Trade-off: It is a general-purpose UPS rather than a lock-specific device, so runtime depends entirely on what else is plugged in, and a fully loaded outlet strip will drain it quickly.

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Von Duprin PS914-BBK Power Supply with Battery Backup Kit

Type: Power supply with battery backup kit
System: Von Duprin exit hardware
Intended use: Commercial door hardware backup

Von Duprin PS914-BBK Power Supply w/ Battery Backup Kit is the heavy-duty end of the market. It pairs a power supply with a battery backup kit for Von Duprin exit devices, the push-bar hardware common on commercial and institutional doors. In a blackout, the door hardware keeps functioning instead of failing locked or failing open.

This is a specification-driven purchase for a contractor or building engineer working to a hardware schedule. The kit format means the supply and its backup are matched, which removes guesswork about whether the battery is right for the unit. Buildings with code-driven egress requirements are the natural audience.

Trade-off: The price is commercial-grade and the unit is tied to Von Duprin hardware, so it is overkill for any residential smart lock.

Check the current price on Amazon

Before You Buy

• Compatibility: Match the backup to the lock family first. A myQ battery will not run a Saflok door, and a DC12V access box will not charge a consumer lock.
• Power type: Decide between a swappable battery pack, a hardwired DC supply, and a general-purpose UPS. Each solves a different version of the outage problem.
• Capacity: For a UPS, add up everything that will be plugged in. The lock alone draws little; a router and monitor change the runtime math.
• Installation: Mains-wired boxes and commercial kits need an electrician or access-control technician. Battery packs and plug-in UPS units do not.
• Mounting: Check where the unit will live. Wall-mount and enclosure formats suit a utility closet; a compact UPS can sit on a shelf near the door.
• Spares: For battery-pack locks, a second charged pack is the cheapest insurance against a lockout during an outage.

Frequently Asked Questions

1. Will a smart lock still work during a power cut?
   It depends on the lock. Battery-powered locks keep running because they never relied on house wiring; mains-powered electric locks need a backup supply or UPS to stay operational.

2. What is the best smart lock backup power option for a home?
   A rechargeable spare battery for the lock’s own brand is the simplest route. A compact lithium UPS is the better fit when the lock shares an outlet with a router or desk devices.

3. How long will a UPS keep a smart lock running?
   A lock draws very little on its own, so a small UPS can carry it for a long stretch. Adding networking gear or a monitor to the same unit shortens that window considerably.

4. Can any UPS be used with an electric door lock?
   Only if the lock’s power adapter matches the UPS output and the lock is designed to run from that supply. Hardwired access-control locks generally need a dedicated DC power box instead.

5. Is a commercial power supply worth it for a single door?
   Rarely. Commercial kits like the Von Duprin unit are built for code-driven egress hardware across a building, and the cost only makes sense at that scale.

6. Should a spare battery be kept charged?
   Yes. A spare pack that has sat empty for months may not be ready when needed, so rotating it through the lock periodically keeps it usable.

Bottom Line

For most households, the CHAMBERLAIN myQ Smart Lock Rechargeable Battery is the best smart lock backup power option for a power cut because it solves the problem at the lock itself with no wiring and no setup. Buyers running electric door hardware or a home office full of gear should look to the access-control box or the GOLDENMATE UPS instead.