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.
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.
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.
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.
| 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 |
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Yes. The battery has a USB-C charging connection, and the current product package includes a USB-C charging cable.
A USB-C charging cable is included, but current official product information does not specifically confirm that a USB wall adapter is included.
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.
Compatibility should not be assumed. Those products may use different rechargeable battery packs. Order the exact battery part number specified for the device.
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.
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.