LiftMaster MYQLB4AXXB Smart Lock Battery Compatibility and Charging Details
The LiftMaster myQ MYQLB4AXXB is a removable rechargeable lithium-ion battery designed for the myQ Secure View 3-in-1 Smart Lock. It can replace a worn or damaged original battery or be kept charged as a spare to reduce downtime while the primary battery is recharging.
The MYQLB4AXXB is rated at 7.7 VDC, 8,500 mAh, and 65.45 Wh. It charges through a USB-C connection and installs in the compatible smart lock without special tools.
Compatible With
- LiftMaster myQ MYQL90AXXB Secure View 3-in-1 Smart Lock
- Select myQ smart locks that specifically identify MYQLB4AXXB as the required replacement battery
Exact compatibility with additional myQ smart-lock models could not be fully confirmed. Verify the complete lock model number, original battery label, voltage, capacity, housing shape, and electrical contacts before ordering.
What This Battery Powers
When installed in the compatible smart lock, the MYQLB4AXXB supplies power for the motorized deadbolt, camera, video doorbell, touchscreen, Wi-Fi connection, app communication, and supported electronic access features.
The battery does not provide programming, video storage, Wi-Fi service, mechanical key access, or myQ account services by itself. Those features depend on the compatible lock, myQ app, internet connection, account settings, and any applicable monitoring plan.
Spare Battery Benefits
Keeping a second charged MYQLB4AXXB available allows the depleted battery to be removed and replaced without leaving the smart lock offline during charging. This helps maintain electronic locking, camera, doorbell, notification, and app-control functions.
A spare rechargeable battery does not replace the need for a physical key or another approved emergency-entry method. Keep at least one working mechanical key available outside the locked property.
Features and Specifications
| Specification | Details |
| Brand | LiftMaster myQ |
| Part Number | MYQLB4AXXB |
| Product Type | Removable rechargeable smart-lock battery |
| Battery Chemistry | Lithium-ion |
| Nominal Voltage | 7.7 VDC |
| Capacity | 8,500 mAh |
| Energy Rating | 65.45 Wh |
| Charging Connection | USB-C |
| Installation Method | Tool-free removable battery swap |
| Color | Gray |
| Published Operating Temperature | -4 F to 140 F |
| Confirmed Lock Compatibility | LiftMaster myQ MYQL90AXXB Secure View 3-in-1 Smart Lock |
| Package Contents | One MYQLB4AXXB rechargeable battery and one USB-C charging cable |
| USB Wall Adapter Included | Not confirmed as included |
| Published Charging Time | Exact charging time not publicly confirmed |
| Manufacturer Warranty | 1 year, subject to current manufacturer terms |
Charging the MYQLB4AXXB
Remove the battery according to the smart-lock instructions and connect the included USB-C cable to a suitable USB charging source. Place the battery on a dry, stable surface away from excessive heat, direct sunlight, water, and combustible materials while charging.
An exact charging time is not published in current product information. Charging time can vary with battery condition, remaining charge, ambient temperature, cable condition, and the output of the USB charging source.
The package includes a USB-C charging cable. A USB wall adapter is not specifically confirmed as included, so a compatible charging source may need to be supplied separately.
Battery Replacement Procedure
- Unlock or open the door before removing the installed battery.
- Remove the interior smart-lock cover according to the lock instructions.
- Pull the depleted battery straight out without forcing the contacts.
- Inspect the battery compartment and contacts for dirt, corrosion, bending, or damage.
- Insert the charged MYQLB4AXXB fully in the correct orientation.
- Reinstall the interior cover and confirm that it is secure.
- Test mechanical key access, electronic locking, app control, camera, and doorbell operation.
Do not force the battery into the compartment. Stop and verify the part number and orientation if the battery does not slide into place normally.
Important Compatibility Warning
Do not order this battery solely because another myQ product uses a removable rechargeable battery. myQ video keypads, video doorbells, cameras, garage accessories, and older smart locks may use different housings, connectors, voltages, capacities, or charging systems.
Use the exact MYQLB4AXXB replacement when specified. A similar-looking battery may fit incorrectly, damage the lock contacts, use the wrong charging characteristics, or fail to communicate the correct battery condition to the lock.
Not Automatically Compatible With
- myQ Video Keypad battery packs
- myQ Video Doorbell battery packs
- LiftMaster garage door opener backup batteries
- LiftMaster gate operator batteries
- Standard AA, AAA, 9V, or coin-cell batteries
- Unverified third-party rechargeable battery packs
- Smart locks that do not specifically list MYQLB4AXXB
Similar-Looking Parts That May Not Interchange
Other myQ devices may use removable gray or black battery packs that appear similar in online images. Appearance alone is not a reliable compatibility check. Compare the complete part number, voltage, capacity, connector location, contact arrangement, housing dimensions, and device compatibility before substituting another battery.
Also Known As and Related Part Numbers
- MYQLB4AXXB
- LiftMaster myQ Smart Lock Rechargeable Battery
- myQ Secure View 3-in-1 Smart Lock Battery
- myQ Video Smart Lock Battery
- MYQL90AXXB compatible replacement battery
- MYQL90AXXB compatible spare battery
Before Ordering Checklist
- Confirm the smart-lock model number is MYQL90AXXB or another model that specifically requires MYQLB4AXXB.
- Verify the MYQLB4AXXB part number on the original battery label.
- Compare the original battery's 7.7 VDC rating.
- Compare the original battery's 8,500 mAh and 65.45 Wh ratings.
- Inspect the battery housing, contacts, and charging port.
- Confirm whether the problem is the battery, charging cable, USB power source, or smart lock.
- Do not substitute a battery intended for a myQ video keypad or doorbell.
- Confirm that a suitable USB charging source is available.
- Keep a physical key available during charging and troubleshooting.
Battery Runtime and Performance
Actual smart-lock operating time depends on Wi-Fi signal strength, camera recordings, live viewing, doorbell use, motion events, biometric access, ambient temperature, lock cycles, and mechanical deadbolt resistance.
A binding deadbolt or misaligned strike can force the lock motor to work harder and shorten battery life. Repair door sag, weather-strip pressure, latch interference, or strike misalignment before repeatedly replacing batteries.
Troubleshooting a Battery That Discharges Quickly
- Check the Wi-Fi signal at the entry door.
- Review camera recording and live-view activity.
- Inspect the deadbolt for binding or repeated lock retries.
- Confirm that the door closes and aligns correctly with the strike.
- Verify that the battery reaches a full charge.
- Try a different compatible USB-C cable or charging source when charging is unreliable.
- Inspect the lock contacts for dirt, corrosion, or physical damage.
- Check for unusually hot or cold installation conditions.
A replacement battery will not correct damaged contacts, an unreliable USB charging source, a jammed deadbolt, incorrect lock calibration, weak Wi-Fi, or failed internal lock electronics.
Technician Note
Frequent low-battery notifications are often caused by a mechanical or network issue rather than battery age alone. A properly aligned deadbolt should extend and retract smoothly without the motor forcing the bolt against the strike plate.
Test the lock with the door open and closed. If the lock operates normally with the door open but struggles when closed, correct the door or strike alignment before replacing another battery.
Lithium-Ion Battery Safety
Do not install or charge a battery that is swollen, cracked, punctured, leaking, unusually hot, or physically damaged. Do not open the battery housing, short the electrical contacts, crush the battery, expose it to fire, or attempt to replace its internal cells.
Stop using the battery if it develops an unusual odor, excessive heat, deformation, or charging fault. Damaged lithium-ion batteries should be handled and recycled according to applicable local requirements.
Professional Advisory
Keep the supplied mechanical key available in a secure location outside the locked property. A charged spare battery can reduce downtime but should not be the only emergency-access method.
Repeated lock jams, damaged battery contacts, overheating, charging faults, door misalignment, or unreliable emergency access should be inspected by a qualified locksmith, door technician, or access-control professional.
Product Questions and Answers
Which smart lock is compatible with the LiftMaster MYQLB4AXXB battery?
The battery is confirmed for the myQ Secure View 3-in-1 Smart Lock, including the MYQL90AXXB family. Verify the exact lock model and original battery label before ordering for another myQ smart lock.
What are the voltage and capacity of the MYQLB4AXXB?
The battery is rated at 7.7 VDC, 8,500 mAh, and 65.45 Wh. Do not substitute a battery with an unverified voltage, connector, capacity, or charging system.
Does the MYQLB4AXXB use a USB-C charging connection?
Yes. The battery has a USB-C charging connection, and the current product package includes a USB-C charging cable.
Is a USB wall charger included with the battery?
A USB-C charging cable is included, but current official product information does not specifically confirm that a USB wall adapter is included.
Can the battery be changed without tools?
Yes. LiftMaster describes the MYQLB4AXXB as a tool-free battery swap. Remove the interior lock cover, replace the battery, and confirm that the battery is fully seated.
Will this battery fit a myQ Video Keypad or Video Doorbell?
Compatibility should not be assumed. Those products may use different rechargeable battery packs. Order the exact battery part number specified for the device.
How long does the MYQLB4AXXB take to recharge?
An exact charging time is not published on the current official product page. Charging time can depend on the battery condition and USB charging source.
Why does the smart lock battery discharge quickly after replacement?
Weak Wi-Fi, frequent video activity, cold temperatures, a binding deadbolt, poor door alignment, repeated lock retries, damaged contacts, or an internal lock problem can increase battery use.
