Liftmaster 41B591 Battery Replacement Set for 475LM
EverCharge Standby Power System Replacement Battery Set for the 475LM.
Liftmaster original equipment replacement part.
Don't get stuck. Make sure your batteries are fresh so you can depend on your garage door opener when the power goes out.
Liftmaster garage door opener models that may be equipped with this optional battery backup system: 2500B, 3500, 3800, 8500