Chamberlain LiftMaster 485LM Battery Backup – OEM 4228 for Garage Door Openers

Power through outages with the Chamberlain 485LM Battery Backup

When the lights go out, your routine can still roll on. The Chamberlain LiftMaster 485LM battery backup keeps your garage door operable, so you can come and go with ease during a power outage. This OEM backup is designed as a drop-in replacement for compatible LiftMaster systems, delivering reliable backup power when you need it most.

Key benefits at a glance

• Maintains door operation during outages, preserving access to home and vehicles.
• 100% OEM backup unit with new production dates for compatibility and reliability.
• Factory-supplied updates ensure you’re using current production specs.
• Versatile compatibility, working with older and newer backup units from Sears and Home Depot.
• Supports all slide-in battery backups, including 385/855 and newer models, for easier upgrades.

Real-world uses

Imagine pulling into your driveway after a long day, the street lights flicker, and your garage door opens on cue. In a few seconds, you’re inside, with room to park and unload groceries without hunting for a flashlight. The OEM backup performs quietly in the background, so you notice power issues less and your routine stays intact.

In a family home, you might rely on the backup to keep the garage climate comfortable, or to allow daily access for kids, pets, or caregivers when the main power is unstable. Its compatibility with different back-ups makes it a flexible option for homes using 385/855 or other slide-in batteries.

Installation and maintenance

Easy, do-it-yourself replacement steps help you replace the battery quickly and with minimal tools. Always start by safely disconnecting power to the opener, then follow the steps to seat the fresh battery and reconnect power. The process emphasizes proper terminal connections and secure battery cover sealing.

• Disconnect power to the opener before starting.
• Open the motor unit’s battery cover and remove the old battery.
• Insert the new battery with terminals facing outward, connect red/black wires to the matching terminals.
• Reattach the battery cover and restore power to test operation.

What you get

OEM 485LM battery backup unit (LiftMaster part number 4228) built to pair with compatible LiftMaster systems, designed to align with current production specs for reliable backup power.