The LiftMaster 485LM Battery Back Up Replacement Battery is the factory-recommended rechargeable battery used to restore power to LiftMaster garage door openers equipped with a Battery Backup feature. It keeps your door operating during outages so you can safely open and close the garage when utility power is unavailable. This replacement part is commonly used in LiftMaster openers with integrated backup such as select Elite Series belt-drive units (e.g., 8550/8550W families) and in systems that use the EverCharge 475LM Battery Backup accessory, as well as comparable Chamberlain models. It is also cross-referenced by Chamberlain part 4228 and LiftMaster/Chamberlain service part 41A6357-1, making it a direct, OEM-compatible swap for many residential and light commercial applications.
Engineered for the opener’s on-board charging system, the 485LM is a 12 VDC sealed, maintenance-free battery designed to deliver standby power for normal door operation during a blackout; actual run time and number of cycles depend on the opener model, door weight/balance, and ambient temperature. Installation is straightforward: disconnect AC power, open the battery compartment in the opener head or 475LM backup module, observe polarity markings, transfer the leads to the new battery, and restore power to allow a full recharge (typically within 24 hours). No programming is required; the opener’s status indicator will clear once charging is complete. Replace the battery when the unit signals a low/replace condition with beeps or a battery LED, and recycle the old battery in accordance with local regulations. This genuine-style replacement supports LiftMaster battery backup garage door opener systems for dependable, code-compliant access when you need it most.
