Liftmaster 485LM Replacement Battery
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Make sure the products you installed are still working properly and update their opener with a fresh battery. If you installed any openers with EverCharge® Standby Power systems, below are the replacement batteries required:
Garage Door Opener Model(s) Battery Replacement
2500B, 3500 & 3800 with the 475LM 41B591 (2 pack battery)
3850, 3850P 485LM